SECOND AMENDED AND RESTATED CREDIT AGREEMENT Dated as of September 16, 2011 among THE FINANCIAL INSTITUTIONS NAMED HEREIN as the Lenders and BANK OF AMERICA, N.A. as the Agent WELLS FARGO CAPITAL FINANCE, LLC as Documentation Agent DEUTSCHE BANK TRUST...

Exhibit 10.1

EXECUTION VERSION

SECOND AMENDED AND RESTATED CREDIT AGREEMENT

Dated as of September 16, 2011

among

THE FINANCIAL INSTITUTIONS NAMED HEREIN

as the Lenders

and

BANK OF AMERICA, N.A.

as the Agent

▇▇▇▇▇ FARGO CAPITAL FINANCE, LLC

as Documentation Agent

DEUTSCHE BANK TRUST COMPANY AMERICAS

and

JPMORGAN CHASE BANK, N.A.

as Co-Syndication Agents

▇▇▇▇▇▇▇ LYNCH, PIERCE, ▇▇▇▇▇▇ & ▇▇▇▇▇ INCORPORATED

as the Sole Lead Arranger and Book Manager

and

WESTLAKE CHEMICAL CORPORATION

and each other Person listed on Schedule 1 hereto,

as the Borrowers

$400,000,000

TABLE OF CONTENTS


*Section*		Page

ARTICLE 1. LOANS AND LETTERS OF CREDIT		1
1.1	Total Facility.	1
1.2	Revolving Loans.	1
1.3	Letters of Credit.	5
1.4	Bank Products.	10

ARTICLE 2. INTEREST AND FEES		10
2.1	Interest.	10
2.2	Continuation and Conversion Elections.	11
2.3	Maximum Interest Rate.	12
2.4	Closing Fee.	12
2.5	Unused Line Fee.	12
2.6	Letter of Credit Fee.	13

ARTICLE 3. PAYMENTS AND PREPAYMENTS		13
3.1	Revolving Loans.	13
3.2	Full or Partial Termination of Facility.	13
3.3	Prepayments of the Loans.	13
3.4	LIBOR Rate Loan Prepayments.	14
3.5	Payments by the Borrowers.	14
3.6	Payments as Revolving Loans.	14
3.7	Apportionment, Application and Reversal of Payments.	14
3.8	Indemnity for Returned Payments.	15
3.9	Agent’s and Lenders’ Books and Records; Monthly Statements.	15

ARTICLE 4. TAXES, YIELD PROTECTION AND ILLEGALITY		16
4.1	Taxes.	16
4.2	Illegality.	18
4.3	Increased Costs; Capital Adequacy.	18
4.4	Funding Losses.	19
4.5	Inability to Determine Rates.	19
4.6	Certificates of the Agent.	20
4.7	Delay in Requests.	20
4.8	Mitigation.	20
4.9	Replacement of Lenders.	20
4.10	Survival.	20

ARTICLE 5. BOOKS AND RECORDS; FINANCIAL INFORMATION; NOTICES		21
5.1	Books and Records.	21
5.2	Financial Information.	21
5.3	Notices to the Agent.	25

ARTICLE 6. GENERAL WARRANTIES AND REPRESENTATIONS		27
6.1	Authorization, Validity, and Enforceability of this Agreement and the Loan Documents.	27
6.2	Validity and Priority of Security Interest.	27
6.3	Organization and Qualification.	27


6.4	Corporate Name; Prior Transactions.	27
6.5	Subsidiaries and Affiliates.	28
6.6	Financial Statements and Projections.	28
6.7	Solvency.	28
6.8	Real Estate; Leases.	28
6.9	Proprietary Rights.	29
6.10	Trade Names.	29
6.11	Litigation.	29
6.12	Labor Disputes.	29
6.13	Environmental Laws.	29
6.14	No Violation of Law.	30
6.15	No Default.	30
6.16	ERISA Compliance.	31
6.17	Taxes.	31
6.18	Regulated Entities.	31
6.19	Use of Proceeds; Margin Regulations.	31
6.20	Copyrights, Patents, Trademarks and Licenses, etc.	32
6.21	No Material Adverse Change.	32
6.22	Full Disclosure.	32
6.23	Locations of Collateral.	32
6.24	Deposit Accounts.	32
6.25	Governmental Authorization.	32
6.26	No Restrictions.	33

ARTICLE 7. AFFIRMATIVE AND NEGATIVE COVENANTS		33
7.1	Taxes and Other Obligations.	33
7.2	Legal Existence and Good Standing.	33
7.3	Compliance with Law and Agreements; Maintenance of Licenses; Amendments to Charter Documents.	33
7.4	Maintenance of Property; Inspection of Property.	34
7.5	Insurance.	34
7.6	Insurance and Condemnation Proceeds.	35
7.7	Environmental Laws.	35
7.8	Compliance with ERISA.	36
7.9	Mergers; Consolidations; or Sales.	36
7.10	Distributions; Capital Change; Restricted Investments.	37
7.11	Transactions Affecting Collateral or Obligations.	39
7.12	Guaranties.	39
7.13	Debt.	39
7.14	Payment / Prepayment of Debt.	40
7.15	Transactions with Affiliates.	41
7.16	Business Conducted.	41
7.17	Liens.	42
7.18	Sale and Leaseback Transactions.	42
7.19	New Subsidiaries.	42
7.20	Fiscal Year.	42
7.21	Fixed Charge Coverage Ratio.	42
7.22	Use of Proceeds.	42
7.23	Collateral.	42
7.24	Tax Shelter Regulations.	44
7.25	Permitted Acquisitions.	44


7.26	Excluded Deposit Accounts.	45
7.27	Further Assurances.	45

ARTICLE 8. CONDITIONS OF LENDING		46
8.1	Conditions Precedent to Making of Loans on the Closing Date.	46
8.2	Conditions Precedent to Each Loan.	48

ARTICLE 9. DEFAULT; REMEDIES		48
9.1	Events of Default.	48
9.2	Remedies.	51

ARTICLE 10. TERM AND TERMINATION		52
10.1	Term and Termination.	52

ARTICLE 11. AMENDMENTS; WAIVERS; PARTICIPATIONS; ASSIGNMENTS; SUCCESSORS		53
11.1	Amendments and Waivers.	53
11.2	Assignments; Participations.	54

ARTICLE 12. THE AGENT		57
12.1	Appointment and Authorization.	57
12.2	Delegation of Duties.	57
12.3	Liability of Agent.	57
12.4	Reliance by Agent.	57
12.5	Notice of Default.	58
12.6	Credit Decision.	58
12.7	Indemnification.	58
12.8	Agent in Individual Capacity.	59
12.9	Successor Agent.	59
12.10	Collateral Matters.	59
12.11	Restrictions on Actions by Lenders; Sharing of Payments.	60
12.12	Agency for Perfection.	61
12.13	Payments by Agent to Lenders.	61
12.14	Settlement.	61
12.15	Concerning the Collateral and the Related Loan Documents.	64
12.16	Field Audit and Examination Reports; Disclaimer by Lenders.	64
12.17	Relation Among Lenders.	65
12.18	Co-Agents.	65
12.19	Bank Product Providers.	65

ARTICLE 13. MISCELLANEOUS		66
13.1	No Waivers; Cumulative Remedies.	66
13.2	Severability.	66
13.3	Governing Law; Choice of Forum; Service of Process.	66
13.4	WAIVER OF JURY TRIAL.	67
13.5	Survival of Representations and Warranties.	67
13.6	Other Security and Guaranties.	67
13.7	Fees and Expenses.	68
13.8	Notices.	68
13.9	Waiver of Notices.	69
13.10	Binding Effect.	69


13.11	Indemnity of the Agent, the Arranger, the Letter of Credit Issuers and the Lenders by the Borrowers.	70
13.12	Limitation of Liability.	70
13.13	No Advisory or Fiduciary Responsibility.	71
13.14	Final Agreement.	71
13.15	Counterparts.	71
13.16	Captions.	71
13.17	Right of Setoff.	71
13.18	Confidentiality.	72
13.19	Conflicts with Other Loan Documents.	73
13.20	Westlake as Agent.	73
13.21	Patriot Act Notice.	73
13.22	Restatement of Existing Credit Agreement.	73
13.23	Confirmations.	74
13.24	Electronic Execution.	74

ANNEXES, EXHIBITS AND SCHEDULES


ANNEX A	–	DEFINITIONS

EXHIBIT A	–	FORM OF NOTE
EXHIBIT B	–	FORM OF BORROWING BASE CERTIFICATE
EXHIBIT C	–	FORM OF OBLIGATION GUARANTY
EXHIBIT D	–	FORM OF NOTICE OF BORROWING
EXHIBIT E	–	FORM OF NOTICE OF CONTINUATION/CONVERSION
EXHIBIT F	–	FORM OF ASSIGNMENT AND ACCEPTANCE AGREEMENT
EXHIBIT G	–	FORM OF COMPLIANCE CERTIFICATE

SCHEDULE 1	–	BORROWERS
SCHEDULE 1.2	–	LENDERS’ COMMITMENTS
SCHEDULE 6.4	–	PRIOR CORPORATE NAMES
SCHEDULE 6.5	–	SUBSIDIARIES AND AFFILIATES
SCHEDULE 6.9	–	PROPRIETARY RIGHTS
SCHEDULE 6.10	–	TRADE NAMES
SCHEDULE 6.11	–	LITIGATION
SCHEDULE 6.12	–	LABOR DISPUTES
SCHEDULE 6.13	–	ENVIRONMENTAL LAW
SCHEDULE 6.16	–	ERISA COMPLIANCE
SCHEDULE 6.23	–	LOCATIONS OF COLLATERAL
SCHEDULE 6.24	–	DEPOSIT ACCOUNTS
SCHEDULE 7.10	–	EXISTING INVESTMENTS
SCHEDULE 7.13	–	DEBT AND EXISTING LETTERS OF CREDIT
SCHEDULE 7.17	–	EXISTING LIENS

SECOND AMENDED AND RESTATED CREDIT AGREEMENT

This Second Amended and Restated Credit Agreement, dated as of September 16, 2011 (this “Agreement”) among the financial institutions from time to time parties hereto (such financial institutions, together with their respective successors and assigns, are referred to hereinafter each individually as a “Lender” and collectively as the “Lenders”), Bank of America, N.A. with an office at ▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇, ▇▇▇▇▇, ▇▇▇▇▇, as agent for the Lenders (in its capacity as agent, the “Agent”), and Westlake Chemical Corporation, a Delaware corporation (“Westlake”) and certain of its domestic subsidiaries listed on Schedule 1 hereto, each with offices at ▇▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇ (each a “Borrower” and collectively, all Borrowers, including Westlake, the “Borrowers”).

W I T N E S S E T H:

WHEREAS, Westlake and certain of its domestic subsidiaries as borrowers, the Agent, and lenders party thereto entered into an Amended and Restated Credit Agreement dated as of September 8, 2008, which amended and restated the Credit Agreement dated as of July 31, 2003 among Westlake, certain of its domestic subsidiaries as borrowers, the Agent and the lenders party thereto (as amended, restated, amended and restated, supplemented, or otherwise modified from time to time prior to the date hereof, the “Existing Credit Agreement”);

WHEREAS, Westlake and other Borrowers have requested that the Lenders amend certain provisions of the Existing Credit Agreement, and the parties have agreed to amend and restate the Existing Credit Agreement, in each case, upon the terms and conditions set forth in this Agreement; and

WHEREAS, capitalized terms used in this Agreement and not otherwise defined herein shall have the meanings ascribed thereto in Annex A, which is attached hereto and incorporated herein; the rules of construction contained therein shall govern the interpretation of this Agreement, and all Annexes, Exhibits, and Schedules attached hereto are incorporated herein by reference.

NOW, THEREFORE, in consideration of the mutual conditions and agreements set forth in this Agreement, and for good and valuable consideration, the receipt of which is hereby acknowledged, the Lenders, the Agent, and the Borrowers hereby agree as follows.

ARTICLE 1.

LOANS AND LETTERS OF CREDIT

1.1 Total Facility. Subject to all of the terms and conditions of this Agreement, the Lenders agree to make available a total credit facility of up to $400,000,000 (as such amount may be increased or reduced from time to time pursuant to the terms of this Agreement, the “Total Facility”) to the Borrowers from time to time during the term of this Agreement. The Total Facility shall be composed of a revolving line of credit consisting of Revolving Loans and Letters of Credit described herein.

1.2 Revolving Loans.

(a) Revolving Loans and Notes.

(i) Amounts. Subject to the satisfaction of the conditions precedent set forth in Article 8, each Lender severally, but not jointly, agrees, upon any Borrower’s request

from time to time on any Business Day during the period from the Closing Date to the Termination Date, to make revolving loans (the “Revolving Loans”) to the Borrowers in amounts not to exceed such Lender’s Pro Rata Share of Availability, except for Non-Ratable Loans and Agent Advances. The Lenders, however, in their unanimous discretion, may elect to make Revolving Loans or issue or arrange to have issued Letters of Credit in excess of the Borrowing Base but not in excess of the Maximum Revolver Amount on one or more occasions, but if they do so, neither the Agent nor the Lenders shall be deemed thereby to have changed the limits of the Borrowing Base or to be obligated to exceed such limits on any other occasion. If any Borrowing would exceed Availability, the Lenders may refuse to make or may otherwise restrict the making of Revolving Loans as the Lenders determine until such excess has been eliminated, subject to the Agent’s authority, in its sole discretion, to make Agent Advances pursuant to the terms of Section 1.2(i).

(ii) The Borrowers shall execute and deliver to each Lender requesting a note, a note, an amended and restated note, or a second amended and restated note, as applicable, to evidence the Revolving Loan of that Lender. Each note shall be in the principal amount of the requesting Lender’s Pro Rata Share of the Maximum Revolver Amount, dated the date hereof and substantially in the form of Exhibit A (each a “Note” and, collectively, the “Notes”). Each Note shall represent the obligation of the Borrowers to pay the amount of the requesting Lender’s Pro Rata Share of the Maximum Revolver Amount, or, if less, such Lender’s Pro Rata Share of the aggregate unpaid principal amount of all Revolving Loans to the Borrowers together with interest thereon as prescribed in Section 2.1. The entire unpaid balance of the Revolving Loan and all other Obligations (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination) shall be immediately due and payable in full in immediately available funds on the Termination Date.

(b) Procedure for Borrowing.

(i) Each Borrowing shall be made upon any Borrower’s irrevocable written notice delivered to the Agent in the form of a notice of borrowing in substantially the form of Exhibit D (“Notice of Borrowing”) and signed by Westlake, on its behalf and as agent for the other Borrowers, which Notice of Borrowing shall be received by the Agent prior to (i) 12:00 noon (Houston, Texas time) three (3) Business Days prior to the requested Funding Date, in the case of LIBOR Rate Loans and (ii) 12:30 p.m. (Houston, Texas time) on the requested Funding Date, in the case of Base Rate Loans, specifying:

(A) the amount of the Borrowing, which in the case of a LIBOR Rate Loan must equal or exceed $5,000,000 (and integral increments of $1,000,000 in excess of such amount);

(B) the requested Funding Date, which must be a Business Day;

(C) whether the Revolving Loans requested are to be Base Rate Loans or LIBOR Rate Loans (and if not specified, it shall be deemed a request for a Base Rate Loan);

(D) the duration of the Interest Period for LIBOR Rate Loans (and if not specified, it shall be deemed a request for an Interest Period of one month); and

(E) the Borrower or Borrowers which are to receive all or any portion of such Borrowing and the amount of such Borrowing to be advanced to such Borrower or Borrowers.

(ii) In lieu of delivering a Notice of Borrowing, the Borrowers may give the Agent telephonic notice of such request for advances to the Designated Account on or before the deadline set forth above. The Agent at all times shall be entitled to rely on such telephonic notice in making such Revolving Loans, regardless of whether any written confirmation is received.

(iii) In lieu of delivering a Notice of Borrowing, the Borrowers may also request Borrowings in accordance with any ancillary agreements entered into by the Agent and the Borrowers from time to time relating to borrowing procedures.

(iv) The Borrowers shall have no right to request a LIBOR Rate Loan while a Default or Event of Default has occurred and is continuing.

(c) Reliance upon Authority. Prior to the Closing Date, the Borrowers shall deliver to the Agent, a notice setting forth the account of the Borrowers (“Designated Account”) to which the Agent is authorized to transfer the proceeds of the Revolving Loans requested hereunder. The Borrowers may designate a replacement account from time to time by written notice. All such Designated Accounts must be reasonably satisfactory to the Agent. The Agent is entitled to rely conclusively on any person’s request for Revolving Loans on behalf of the Borrowers, so long as the proceeds thereof are to be transferred to the Designated Account. The Agent has no duty to verify the identity of any individual representing himself or herself as a person authorized by the Borrowers to make such requests on its behalf.

(d) No Liability. The Agent shall not incur any liability to the Borrowers as a result of acting upon any notice referred to in Sections 1.2(b) and (c), which the Agent believes in good faith to have been given by an officer or other person duly authorized by any Borrower to request Revolving Loans on its behalf. The crediting of Revolving Loans to the Designated Account conclusively establishes the obligation of the Borrowers to repay such Revolving Loans as provided herein.

(e) Notice Irrevocable. Any Notice of Borrowing (or telephonic notice in lieu thereof) made pursuant to Section 1.2(b) shall be irrevocable. The Borrowers shall be bound to borrow the funds requested therein in accordance therewith.

(f) Agent’s Election. Promptly after receipt of a Notice of Borrowing (or telephonic notice in lieu thereof), the Agent shall elect to have the terms of Section 1.2(g) or the terms of Section 1.2(h) apply to such requested Borrowing. If the Bank declines in its sole discretion to make a Non-Ratable Loan pursuant to Section 1.2(h), the terms of Section 1.2(g) shall apply to the requested Borrowing.

(g) Making of Revolving Loans. If the Agent elects to have the terms of this Section 1.2(g) apply to a requested Borrowing, then promptly after receipt of a Notice of Borrowing or telephonic notice in lieu thereof, the Agent shall notify the Lenders by telecopy,

telephone or e-mail of the requested Borrowing. Each Lender shall transfer its Pro Rata Share of the requested Borrowing available to the Agent in immediately available funds, to the account from time to time designated by the Agent, not later than 2:30 p.m. (Houston, Texas time) on the applicable Funding Date. After the Agent’s receipt of all proceeds of such Revolving Loans, the Agent shall make the proceeds of such Revolving Loans available to the Borrowers on the applicable Funding Date by transferring same day funds to the Designated Account; provided, however, that the amount of Revolving Loans so made on any date shall not exceed the Availability on such date.

(h) Making of Non-Ratable Loans.

(i) If any Borrower requests a Base Rate Loan and the Agent elects, with the consent of the Bank, to have the terms of this Section 1.2(h) apply to a requested Borrowing, the Bank shall make a Revolving Loan in the amount of that Borrowing available to the Borrowers on the applicable Funding Date by transferring same day funds to the Designated Account. Each Revolving Loan made solely by the Bank pursuant to this Section 1.2(h) is herein referred to as a “Non-Ratable Loan,” and such Revolving Loans are collectively referred to as the “Non-Ratable Loans.” Each Non-Ratable Loan shall be subject to all the terms and conditions applicable to other Revolving Loans except that all payments thereon shall be payable to the Bank solely for its own account. The aggregate amount of Non-Ratable Loans outstanding at any time shall not exceed $40,000,000. The Agent shall not request the Bank to make any Non-Ratable Loan if (1) the Agent has received written notice from any Lender that one or more of the applicable conditions precedent set forth in Article 8 will not be satisfied on the requested Funding Date for the applicable Borrowing, or (2) the requested Borrowing would exceed Availability on that Funding Date.

(ii) The Non-Ratable Loans shall be secured by the Agent’s Liens in and to the Collateral and shall constitute Base Rate Loans and Obligations hereunder.

(i) Agent Advances.

(i) Subject to the limitations set forth below, the Agent is authorized by the Borrowers and the Lenders, from time to time in the Agent’s sole discretion, (A) after the occurrence of a Default or an Event of Default, or (B) at any time that any of the other conditions precedent set forth in Article 8 have not been satisfied, to make Base Rate Loans to the Borrowers on behalf of the Lenders in an aggregate amount outstanding at any time not to exceed 5% of the Borrowing Base but not in excess of the Maximum Revolver Amount which the Agent, in its reasonable business judgment, deems necessary or desirable (1) to preserve or protect the Collateral, or any portion thereof, (2) to enhance the likelihood of, or maximize the amount of, repayment of the Revolving Loans and other Obligations, or (3) to pay any other amount chargeable to the Borrowers pursuant to the terms of this Agreement, including costs, fees, and expenses as described in Section 13.7 (any of such advances are herein referred to as “Agent Advances”); provided, that the Majority Lenders may at any time revoke the Agent’s authorization to make Agent Advances. Any such revocation must be in writing and shall become effective prospectively upon the Agent’s receipt thereof.

(ii) The Agent Advances shall be secured by the Agent’s Liens in and to the Collateral and shall constitute Base Rate Loans and Obligations hereunder.

(j) Increase in Commitments. The Borrowers may request an increase in the Commitments from time to time upon notice to the Agent, as long as (a) the requested increase is in a minimum amount of $25,000,000 and is offered on the same terms as existing Commitments, except for a closing fee specified by the Borrowers, (b) increases under this Section do not exceed $150,000,000 in the aggregate and no more than four (4) increases are made, (c) no reduction in Commitments pursuant to Section 3.2 has occurred prior to the requested increase, (d) the Agent shall have received certified copies of the resolutions of Westlake approving such increase in the Commitments, (e) the increased Commitments shall be on the same terms and conditions as the existing Commitments, (f) the Borrowers shall deliver any legal opinions or other documents reasonably requested by the Agent, and (g) the Borrowers shall pay, on demand, all fees and reasonable costs and expenses (including Attorney Costs) paid or incurred by the Agent and the Arranger in connection with the increase in the Commitments. The Agent shall promptly notify Lenders of the requested increase and, within ten (10) Business Days thereafter, each Lender shall notify the Agent if and to what extent such Lender commits to increase its Commitment; provided that no Lender shall have any obligation to increase its Commitment. Any Lender not responding within such period shall be deemed to have declined an increase. If Lenders fail to commit to the full requested increase, Eligible Assignees may issue additional Commitments and become Lenders hereunder. The Agent may allocate, in its discretion, the increased Commitments among committing Lenders and, if necessary, Eligible Assignees. Provided the conditions set forth in Section 8.2 are satisfied, total Commitments shall be increased by the requested amount (or such lesser amount committed by Lenders and Eligible Assignees) on a date agreed upon by the Agent and the Borrowers, but no later than forty-five (45) days following the Borrowers’ increase request. The Agent, the Borrowers, and new and existing Lenders shall execute and deliver such documents and agreements as the Agent deems appropriate to evidence the increase in and allocations of the Commitments. On the effective date of an increase, all outstanding Revolving Loans, Letter of Credit Obligations and other exposures shall be reallocated among Lenders, and settled by the Agent if necessary, in accordance with Lenders’ adjusted shares of such Commitments.

1.3 Letters of Credit.

(a) Agreement to Issue. Subject to the terms and conditions of this Agreement, each Letter of Credit Issuer, as requested by any Borrower, agrees to issue, and to amend or renew Letters of Credit previously issued by it in accordance with this Section 1.3, for the account of any Borrower one or more commercial/documentary and standby letters of credit (each a “Letter of Credit” and collectively, the “Letters of Credit”) and the Agent agrees to provide credit support or other enhancement to a letter of credit issuer acceptable to the Agent, which issues a letter of credit for the account of any Borrower (any such credit support or enhancement being herein referred to as a “Credit Support”) from time to time during the term of this Agreement. All Existing Letters of Credit shall be deemed to have been issued pursuant hereto, and from and after the Closing Date shall be subject to and governed by the terms and conditions hereof.

(b) Amounts; Outside Expiration Date. A Letter of Credit Issuer shall not have any obligation to issue any Letter of Credit and the Agent shall not have any obligation to provide Credit Support at any time if: (i) the maximum face amount of the requested Letter of Credit is greater than the Unused Letter of Credit Subfacility at such time; (ii) the maximum undrawn amount of the requested Letter of Credit and all commissions, fees, and charges due from the Borrowers in connection with the opening thereof would exceed Availability at such time; or (iii) such Letter of Credit has an expiration date less than thirty (30) days prior to the Stated Termination Date or more than twelve (12) months from the date of issuance for standby letters of credit and 180 days from the date of issuance for documentary letters of credit; provided that

any Letter of Credit issued in connection with the IRBs may have an expiration date of not later than the Termination Date. With respect to any Letter of Credit which contains any “evergreen” or automatic renewal provision, each Lender shall be deemed to have consented to any such extension or renewal unless any such Lender shall have provided to the Agent, written notice that it declines to consent to any such extension or renewal at least thirty (30) days prior to the date on which the applicable Letter of Credit Issuer is entitled to decline to extend or renew the Letter of Credit. If all of the requirements of this Section 1.3 are met and no Default or Event of Default has occurred and is continuing, no Lender shall decline to consent to any such extension or renewal.

(c) Other Conditions. In addition to conditions precedent contained in Article 8, the obligation of a Letter of Credit Issuer to issue any Letter of Credit and the obligation of the Agent to provide Credit Support is subject to the following conditions precedent having been satisfied in a manner reasonably satisfactory to the Agent:

(i) The Borrowers shall have delivered to the applicable Letter of Credit Issuer, at such times and in such manner as such Letter of Credit Issuer may prescribe, an application in form and substance satisfactory to such Letter of Credit Issuer and reasonably satisfactory to the Agent for the issuance of the Letter of Credit and such other documents as may be required pursuant to the terms thereof, and the form, terms and purpose of the proposed Letter of Credit shall be reasonably satisfactory to the Agent and such Letter of Credit Issuer; and

(ii) If a Defaulting Lender exists, no Letter of Credit Issuer shall have any obligation to issue any Letter of Credit and the Agent shall not have any obligation to provide any Credit Support, until such Lender or the Borrowers have entered into arrangements satisfactory to the Agent and the applicable Letter of Credit Issuer to eliminate any Fronting Exposure associated with the Defaulting Lender; and

(iii) As of the date of issuance, no order of any court, arbitrator or Governmental Authority shall purport by its terms to enjoin or restrain money center banks generally from issuing letters of credit of the type and in the amount of the proposed Letter of Credit, and no law, rule or regulation applicable to money center banks generally and no request or directive (whether or not having the force of law) from any Governmental Authority with jurisdiction over money center banks generally shall prohibit, or request that the proposed Letter of Credit Issuer refrain from, the issuance of letters of credit generally or the issuance of such Letters of Credit.

(d) Issuance of Letters of Credit.

(i) Request for Issuance. The Borrowers must notify the Agent of a requested Letter of Credit at least three (3) Business Days prior to the proposed issuance date. Such notice shall be irrevocable and must specify the proposed Letter of Credit Issuer, the original face amount of the Letter of Credit requested, the Business Day of issuance of such requested Letter of Credit, whether such Letter of Credit is standby, commercial, or documentary, whether such Letter of Credit may be drawn in a single or in partial draws, the Business Day on which the requested Letter of Credit is to expire, the purpose for which such Letter of Credit is to be issued, and the beneficiary of the requested Letter of Credit. The Borrowers shall attach to such notice the proposed form of the Letter of Credit.

(ii) Responsibilities of the Agent; Issuance. As of the Business Day immediately preceding the requested issuance date of the Letter of Credit, the Agent shall determine the amount of the applicable Unused Letter of Credit Subfacility and Availability. If (A) the face amount of the requested Letter of Credit is less than the Unused Letter of Credit Subfacility and (B) the amount of such requested Letter of Credit and all commissions, fees, and charges due from the Borrowers in connection with the opening thereof would not exceed Availability, the Agent shall notify the applicable Letter of Credit Issuer and such Letter of Credit Issuer shall issue the requested Letter of Credit on the requested issuance date so long as the other conditions hereof are met. No Letter of Credit Issuer shall issue any Letter of Credit without receiving prior notice or confirmation from the Agent that the foregoing clauses (A) and (B) are met.

(iii) No Extensions or Amendment. No Letter of Credit Issuer shall be obligated to extend or amend any Letter of Credit issued pursuant hereto unless the requirements of this Section 1.3 are met as though a new Letter of Credit were being requested and issued.

(e) Assumption of Risk; Rights of Letter of Credit Issuers.

(i) Assumption of Risk by the Borrowers. The Borrowers assume all risks of the acts, omissions or misuses of any Letter of Credit by the beneficiary. In connection with issuance of any Letter of Credit, none of the Agent, any Letter of Credit Issuer or any Lender shall be responsible for the existence, character, quality, quantity, condition, packing, value or delivery of any goods purported to be represented by any Letter of Credit Documents; any differences or variation in the character, quality, quantity, condition, packing, value or delivery of any goods from that expressed in any documents; the form, validity, sufficiency, accuracy, genuineness or legal effect of any documents or of any endorsements thereon; the time, place, manner or order in which shipment of goods is made; partial or incomplete shipment of, or failure to ship, any goods referred to in a Letter of Credit or any Letter of Credit Documents; any deviation from instructions, delay, default or fraud by any shipper or other Person in connection with any goods, shipment or delivery; any breach of contract between a shipper or vendor and a Borrower; errors, omissions, interruptions or delays in transmission or delivery of any messages, by mail, cable, telegraph, telex, telecopy, e-mail, telephone or otherwise; errors in interpretation of technical terms; the misapplication by a beneficiary of any Letter of Credit or the proceeds thereof; or any consequences arising from causes beyond the control of any Letter of Credit Issuer, the Agent or any Lender, including any act or omission of a Governmental Authority. The rights and remedies of the Letter of Credit Issuers under the Loan Documents shall be cumulative. The Letter of Credit Issuers shall be fully subrogated to the rights and remedies of each beneficiary whose claims against the Borrowers are discharged with proceeds of any Letter of Credit. Nothing set forth herein shall prevent the Borrowers, following reimbursement in respect of any Letter of Credit, from asserting claims against a Letter of Credit Issuer for any honor of any Letter of Credit constituting gross negligence or willful misconduct.

(ii) Rights of Letter of Credit Issuers. In connection with its administration of and enforcement of rights or remedies under any Letters of Credit or Letter of Credit Documents, a Letter of Credit Issuer shall be entitled to act, and shall be fully protected in acting, upon any certification, documentation or communication in whatever form believed by such Letter of Credit Issuer, in good faith, to be genuine and correct and to have been signed, sent or made by a proper Person. A Letter of Credit Issuer may consult

with and employ legal counsel, accountants and other experts to advise it concerning its obligations, rights and remedies, and shall be entitled to act upon, and shall be fully protected in any action taken in good faith reliance upon, any advice given by such experts. A Letter of Credit Issuer may employ agents and attorneys-in-fact in connection with any matter relating to Letters of Credit or Letter of Credit Documents, and shall not be liable for the negligence or misconduct of agents and attorneys-in-fact selected with reasonable care.

(iii) Account Party. The Borrowers hereby authorize and direct any Letter of Credit Issuer to name any Borrower as the “Account Party” therein and to deliver to the Agent all instruments, documents, and other writings and property received by such Letter of Credit Issuer pursuant to the Letter of Credit, and to accept and rely upon the Agent’s instructions and agreements with respect to all matters arising in connection with the Letter of Credit or the application therefor.

(f) Reimbursement; Participations.

(i) If any Letter of Credit Issuer honors any request for payment under a Letter of Credit, the Borrowers shall pay to such Letter of Credit Issuer, on the same day (“Reimbursement Date”), the amount paid by such Letter of Credit Issuer under such Letter of Credit, together with interest at the interest rate for Base Rate Loans from the Reimbursement Date until payment by the Borrowers. The obligation of the Borrowers to reimburse a Letter of Credit Issuer for any payment made under a Letter of Credit shall be absolute, unconditional, irrevocable, and joint and several, and shall be paid without regard to any lack of validity or enforceability of any Letter of Credit or the existence of any claim, setoff, defense or other right that the Borrowers may have at any time against the beneficiary. Whether or not the Borrowers submit a Notice of Borrowing, the Borrowers shall be deemed to have requested a Borrowing of Base Rate Loans in an amount necessary to pay all amounts due a Letter of Credit Issuer on any Reimbursement Date and each Lender agrees to fund its Pro Rata Share of such Borrowing whether or not the Commitments have terminated, an overadvance exists or is created thereby, or the conditions in Article 8 are satisfied.

(ii) Upon issuance of a Letter of Credit, each Lender shall be deemed to have irrevocably and unconditionally purchased from the applicable Letter of Credit Issuer, without recourse or warranty, an undivided Pro Rata Share interest and participation in all Letter of Credit Obligations relating to such Letter of Credit. If a Letter of Credit Issuer makes any payment under a Letter of Credit and the Borrowers do not reimburse such payment on the Reimbursement Date, the Agent shall promptly notify the Lenders and each Lender shall promptly (within one Business Day) and unconditionally pay to the Agent, for the benefit of such Letter of Credit Issuer, the Lender’s Pro Rata Share of such payment. Upon request by a Lender, a Letter of Credit Issuer shall furnish copies of any Letters of Credit and Letter of Credit Documents in its possession at such time.

(iii) The obligation of each Lender to make payments to the Agent for the account of a Letter of Credit Issuer in connection with such Letter of Credit Issuer’s payment under a Letter of Credit shall be absolute, unconditional and irrevocable, not subject to any counterclaim, setoff, qualification or exception whatsoever, and shall be made in accordance with this Agreement under all circumstances, irrespective of any lack of validity or unenforceability of any Loan Documents; any draft, certificate or other document presented under a Letter of Credit having been determined to be forged,

fraudulent, invalid or insufficient in any respect or any statement therein being untrue or inaccurate in any respect; or the existence of any setoff or defense that any Obligor may have with respect to any Obligations. The Letter of Credit Issuers do not assume any responsibility for any failure or delay in performance or any breach by any Borrower or other Person of any obligations under any Letter of Credit Documents. The Letter of Credit Issuers do not make to Lenders any express or implied warranty, representation or guaranty with respect to the Collateral, the Letter of Credit Documents or any Account Party. The Letter of Credit Issuers shall not be responsible to any Lender for any recitals, statements, information, representations or warranties contained in, or for the execution, validity, genuineness, effectiveness or enforceability of any Letter of Credit Documents; the validity, genuineness, enforceability, collectibility, value or sufficiency of any Collateral or the perfection of any Lien therein; or the assets, liabilities, financial condition, results of operations, business, creditworthiness or legal status of any Account Party.

(iv) No Letter of Credit Indemnitee shall be liable to any Lender or other Person for any action taken or omitted to be taken in connection with any Letter of Credit Documents except as a result of its actual gross negligence or willful misconduct. A Letter of Credit Issuer shall not have any liability to any Lender if such Letter of Credit Issuer refrains from any action under a Letter of Credit or LC Documents until it receives written instructions from Required Lenders.

(g) Supporting Letter of Credit; Cash Collateral. (i) If, notwithstanding the provisions of Section 1.3(b) and Section 10.1, any Letter of Credit or Credit Support is outstanding upon the termination of this Agreement, then upon such termination the Borrowers shall deposit with the Agent, for the ratable benefit of the Agent and the Lenders, with respect to each Letter of Credit or Credit Support then outstanding, a standby letter of credit (a “Supporting Letter of Credit”) in form and substance satisfactory to the Agent, issued by an issuer satisfactory to the Agent in an amount equal to the greatest amount for which such Letter of Credit or such Credit Support may be drawn plus any fees and expenses associated with such Letter of Credit or such Credit Support, under which Supporting Letter of Credit the Agent is entitled to draw amounts necessary to reimburse the Agent and the Lenders for payments to be made by the Agent and the Lenders under such Letter of Credit or Credit Support and any fees and expenses associated with such Letter of Credit or Credit Support. Such Supporting Letter of Credit shall be held by the Agent, for the ratable benefit of the Agent and the Lenders, as security for, and to provide for the payment of, the aggregate undrawn amount of such Letters of Credit or such Credit Support remaining outstanding. In the event Supporting Letters of Credit are not delivered, then the Loan Parties shall provide cash collateral for all remaining Letters of Credit in an amount equal to 110% of the aggregate face amount of such Letters of Credit. (ii) If a Defaulting Lender exists, the Borrowers shall, on demand by any Letter of Credit Issuer or the Agent from time to time, cash collateralize the Pro Rata Share of any Defaulting Lender of the Letter of Credit Obligations.

(h) Auto-Reinstatement Letters of Credit. The Lenders acknowledge that the Letter of Credit issued by the Bank in connection with the IRBs (as amended, renewed, replaced, and extended from time to time, the “IRB L/C”) permits the automatic reinstatement of all or a portion of the stated amount thereof after any drawing thereunder. Unless otherwise directed by the Bank, no Borrower shall be required to make a specific request to the Bank to permit such reinstatement. The Lenders shall be deemed to have authorized (but may not require) the Bank to reinstate all or a portion of the stated amount thereof in accordance with the provisions of the IRB L/C.

(i) Additional Letter of Credit Issuers. The Borrowers and all Additional Letter of Credit Issuers shall comply with all terms and conditions relating to Letters of Credit set forth in this Agreement, including without limitation, Section 1.3(d)(i) above. Each Additional Letter of Credit Issuer shall promptly provide to the Agent a copy of all original Letters of Credit issued by such Additional Letter of Credit Issuer, and all renewals, extensions, amendments, modifications, cancellations, or draws thereof. Each Additional Letter of Credit Issuer shall only issue a Letter of Credit in accordance with this Section 1.3.

(j) Resignation of Letter of Credit Issuer. Any Letter of Credit Issuer may resign at any time upon notice to the Agent and the Borrowers. On the effective date of such resignation, such Letter of Credit Issuer shall have no further obligation to issue, amend, renew, extend or otherwise modify any Letter of Credit, but shall continue to have all rights and obligations of a Letter of Credit Issuer hereunder, including under Sections 1.3 and 13.11, relating to any Letter of Credit issued prior to such date. The Agent shall promptly appoint a replacement Letter of Credit Issuer, which, as long as no Default or Event of Default exists, shall be reasonably acceptable to Borrowers.

1.4 Bank Products. The Loan Parties and their Affiliates (including Westlake Veba Trust) may request and the Agent or Lenders may, in their sole and absolute discretion, arrange for the Loan Parties and their Affiliates (including Westlake Veba Trust) to obtain from the Bank or the Bank’s Affiliates or the Lenders or the Lenders’ Affiliates, Bank Products, although the Loan Parties and their Affiliates (including Westlake Veba Trust) are not required to do so. If Bank Products are provided by an Affiliate of the Bank, any Lender or an Affiliate of a Lender, the Loan Parties agree to indemnify and hold the Agent, the Bank, the Lenders, and their respective Affiliates harmless from any and all costs and obligations now or hereafter incurred by the Agent, the Bank, or any of the Lenders and their respective Affiliates which arise from any indemnity given by the Agent, its Affiliates, or the Lenders or their respective Affiliates related to such Bank Products; provided, however, nothing contained herein is intended to limit any Loan Party’s rights, with respect to the Bank, any Lender or their respective Affiliates, as the case may be, which relate to the Bank Products or the provision of the Bank Products pursuant thereto. The agreement contained in this Section shall survive termination of this Agreement. Each Loan Party acknowledges and agrees that the obtaining of Bank Products from the Bank, any Lender or their respective Affiliates (a) is in the sole and absolute discretion of the Bank, any Lender, or their respective Affiliates, and (b) is subject to all rules and regulations of the Bank, any Lender, or their respective Affiliates.

ARTICLE 2.

INTEREST AND FEES

2.1 Interest.

(a) Interest Rates. All outstanding Revolving Loans shall bear interest on the unpaid principal amount thereof (including, to the extent permitted by law, on interest thereon not paid when due) from the date made until paid in full in cash at a rate determined by reference to the Base Rate or the LIBOR Rate plus the Applicable Margin, but not to exceed the Maximum Rate. If at any time Revolving Loans are outstanding with respect to which the Borrowers have not delivered to the Agent a notice specifying the basis for determining the interest rate applicable thereto in accordance herewith, those Revolving Loans shall bear interest at a rate determined by reference to the Base Rate (unless the Default Rate has been effected by the Agent and the Required Lenders pursuant to Section 2.1(b)) until notice to the contrary has been given to the Agent in accordance with this Agreement and such notice has become effective. Except as otherwise provided herein, the outstanding Revolving Loans shall bear interest as follows:

(i) For all Base Rate Loans at a fluctuating per annum rate equal to the Base Rate plus the Applicable Margin; and

(ii) For all LIBOR Rate Loans at a per annum rate equal to the LIBOR Rate plus the Applicable Margin.

Each change in the Base Rate shall be reflected in the interest rate applicable to Base Rate Loans as of the effective date of such change. All interest charges for LIBOR Rate Loans shall be computed on the basis of a year of 360 days and actual days elapsed (which results in more interest being paid than if computed on the basis of a 365-day year). All interest charges for Base Rate Loans shall be computed on the basis of a year of 365 or 366 days, as the case may be, and for actual days elapsed. The Borrowers shall pay to the Agent, for the ratable benefit of Lenders, interest accrued on all Base Rate Loans in arrears on the first day of each month hereafter and on the Termination Date. The Borrowers shall pay to the Agent, for the ratable benefit of Lenders, interest on all LIBOR Rate Loans in arrears on each LIBOR Interest Payment Date.

(b) Default Rate. If any Event of Default occurs and is continuing and the Agent or the Required Lenders in their discretion so elect, then, while any such Event of Default is continuing, (i) the principal amount of all Revolving Loans shall bear interest at the Default Rate applicable thereto; (ii) the Letter of Credit Fee shall bear interest at the Default Rate applicable thereto; and (iii) any other amount (other than principal of any Revolving Loan and the Letter of Credit Fee) payable by the Borrowers under any Loan Document shall bear interest at the Default Rate applicable to Base Rate Loans.

2.2 Continuation and Conversion Elections.

(a) The Borrowers may:

(i) elect, as of any Business Day, in the case of Base Rate Loans, to convert any Base Rate Loans (or any part thereof in an amount not less than $5,000,000, or that is in an integral multiple of $1,000,000 in excess thereof) into LIBOR Rate Loans; or

(ii) elect, as of the last day of the applicable Interest Period, to continue any LIBOR Rate Loans having Interest Periods expiring on such day (or any part thereof in an amount not less than $1,000,000, or that is in an integral multiple of $1,000,000 in excess thereof);

provided, that if at any time the aggregate amount of LIBOR Rate Loans in respect of any Borrowing is reduced, by payment, prepayment, or conversion of part thereof to be less than $1,000,000, such LIBOR Rate Loans shall automatically convert into Base Rate Loans; provided further that if the notice shall fail to specify the duration of the Interest Period, such Interest Period shall be one (1) month.

(b) Westlake, on its behalf and as agent for the other Borrowers, shall deliver a notice of continuation/conversion (“Notice of Continuation/Conversion”) to the Agent not later than 12:00 noon (Houston, Texas time) at least three (3) Business Days in advance of the Continuation/Conversion Date, if the Revolving Loans are to be converted into or continued as LIBOR Rate Loans and specifying:

(i) the proposed Continuation/Conversion Date;

(ii) the aggregate amount of Loans to be converted or continued;

(iii) the type of Loans resulting from the proposed conversion or continuation; and

(iv) the duration of the requested Interest Period, provided, however, the Borrowers may not select an Interest Period that ends after the Stated Termination Date.

(c) If upon the expiration of any Interest Period applicable to LIBOR Rate Loans, the Borrowers have failed to select timely a new Interest Period to be applicable to LIBOR Rate Loans, the Borrowers shall be deemed to have elected to convert such LIBOR Rate Loans into Base Rate Loans effective as of the expiration date of such Interest Period.

(d) The Agent will promptly notify each Lender of its receipt of a Notice of Continuation/Conversion. All conversions and continuations shall be made ratably according to the respective outstanding principal amounts of the Revolving Loans with respect to which the notice was given held by each Lender.

(e) There may not be more than twelve (12) different LIBOR Rate Loans in effect hereunder at any time.

2.3 Maximum Interest Rate. In no event shall any interest rate provided for hereunder (including any fees or other fees or other compensation which are deemed or determined to be interest) exceed the maximum rate legally chargeable by any Lender under applicable law for such Lender with respect to loans of the type provided for hereunder (the “Maximum Rate”). If, for any period, any interest, absent such limitation, would have exceeded the Maximum Rate, then the interest rate for that period shall be the Maximum Rate, and, if in future periods, that interest rate would otherwise be less than the Maximum Rate, then that interest rate shall remain at the Maximum Rate until such time as the amount of interest paid hereunder equals the amount of interest which would have been paid if the same had not been limited by the Maximum Rate. In the event that, upon payment in full of the Obligations, the total amount of interest paid or accrued under the terms of this Agreement is less than the total amount of interest which would, but for this Section 2.3, have been paid or accrued if the interest rate otherwise set forth in this Agreement had at all times been in effect, then the Borrowers shall, to the extent permitted by applicable law, pay the Agent, for the account of the Lenders, an amount equal to the excess of (a) the lesser of (i) the amount of interest which would have been charged if the Maximum Rate had, at all times, been in effect or (ii) the amount of interest which would have accrued had the interest rate otherwise set forth in this Agreement, at all times, been in effect over (b) the amount of interest actually paid or accrued under this Agreement. If a court of competent jurisdiction determines that the Agent and/or any Lender has received interest and other charges hereunder in excess of the Maximum Rate, such excess shall be deemed received on account of, and shall automatically be applied to reduce, the Obligations other than interest, in the inverse order of maturity, and if there are no Obligations outstanding, the Agent and/or such Lender shall refund to the Borrowers such excess.

2.4 Closing Fee. Borrowers shall pay the Agent for its account the fees described in the Fee Letter (the “Closing Fee”).

2.5 Unused Line Fee. On the first day of each month hereafter and on the Termination Date, the Borrowers agree to pay to the Agent, for the account of the Lenders, in accordance with their respective Pro Rata Shares, an unused line fee (the “Unused Line Fee”) equal to the Applicable Margin for Unused Line Fee times the amount by which the Maximum Revolver Amount exceeded the sum of the average daily outstanding principal amount of Revolving Loans and the average daily undrawn face amount of outstanding Letters of Credit, during the immediately preceding month or shorter period if calculated for the first month hereafter or on the Termination Date. The Unused Line Fee shall be

computed on the basis of a 360-day year for the actual number of days elapsed. All principal payments received by the Agent shall be deemed to be credited to the Borrowers’ Loan Account immediately upon receipt for purposes of calculating the Unused Line Fee pursuant to this Section 2.5.

2.6 Letter of Credit Fee. The Borrowers agree to pay (a) to the Agent, for the account of the Lenders, in accordance with their respective Pro Rata Shares, for each Letter of Credit, a per annum fee (the “Letter of Credit Fee”) equal to the Applicable Margin for LIBOR Rate Loans multiplied by the stated amount of each Letter of Credit, (b) on the date of issuance of any Letter of Credit, to the Agent for the benefit of the applicable Letter of Credit Issuer, a fronting fee of one-eighth of one percent (0.125%) per annum of the undrawn face amount of each Letter of Credit, and (c) on the date of issuance of any Letter of Credit, to the applicable Letter of Credit Issuer, all out-of-pocket costs, fees and expenses incurred by such Letter of Credit Issuer in connection with the application for, processing of, issuance of, or amendment to any Letter of Credit. The Letter of Credit Fee shall be payable monthly in arrears on the first day of each month following any month in which a Letter of Credit is outstanding and on the Termination Date. The Letter of Credit Fee shall be computed on the basis of a 360-day year for the actual number of days elapsed.

ARTICLE 3.

PAYMENTS AND PREPAYMENTS

3.1 Revolving Loans. The Borrowers shall repay the outstanding principal balance of the Revolving Loans, plus all accrued but unpaid interest thereon, on the Termination Date. The Borrowers may prepay Revolving Loans at any time, and reborrow subject to the terms of this Agreement. In addition, and without limiting the generality of the foregoing, upon demand, the Borrowers shall pay to the Agent, for account of the Lenders, the amount, without duplication, by which the Aggregate Revolver Outstandings exceeds the lesser of the Borrowing Base or the Maximum Revolver Amount.

3.2 Full or Partial Termination of Facility.

(a) Termination of Facility. The Borrowers may terminate this Agreement upon at least ten (10) Business Days’ notice (or such shorter period as agreed to by the Agent in its sole discretion) to the Agent, upon Full Payment of all Obligations (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination). On the effective date of termination of this Agreement, any Lender may terminate its and its Affiliates’ Bank Products.

(b) Partial Reduction of Facility. The Borrowers may permanently reduce the Maximum Revolver Amount in increments of $25,000,000 but in no event shall the Maximum Revolver Amount be less than $300,000,000 (the amount of such reduction, the “Partial Termination Amount”) upon at least ten (10) days’ notice to the Agent, upon the payment in full of any Revolving Loans, together with accrued interest thereon, to the extent such Revolving Loans exceed the Maximum Revolver Amount (after giving effect to such reduction). Once reduced in accordance with this Section 3.2(b), the Maximum Revolver Amount may not be increased.

3.3 Prepayments of the Loans.

(a) To the extent set forth in this Section 3.3(a), immediately upon receipt by any Loan Party of proceeds from the sale of any Collateral (other than sales of Inventory in the ordinary course of business), the Borrowers shall prepay the Revolving Loans in an amount equal to 100% of all such proceeds, net of (i) commissions and other reasonable and customary

transaction costs, fees, and expenses properly attributable to such transaction and payable by such Loan Party in connection therewith (in each case, paid to non-Affiliates), (ii) transfer taxes, and (iii) appropriate amounts required to be reserved (in accordance with GAAP) for post-closing adjustments by any Loan Party in connection with such transaction, against any liabilities retained by any Loan Party after such transaction, which liabilities are associated with the asset or assets sold (“Net Sale Proceeds”). No payment from the Net Sale Proceeds shall be required hereunder to the extent Availability exceeds the amount of Revolving Loans outstanding on such date of determination. In addition, 100% of the Net Sale Proceeds shall be deducted from the calculation of the Borrowing Base, but such reduction shall not be deemed to be a permanent reduction of the Maximum Revolver Amount.

(b) Prepayments from the proceeds of all dispositions of Collateral in accordance with Section 3.3(a) shall be applied as follows: first, to accrued interest with respect to the Revolving Loans, second, to pay the principal of the Revolving Loans, and third to cash collateralize outstanding Letters of Credit.

3.4 LIBOR Rate Loan Prepayments. In connection with any prepayment, if any LIBOR Rate Loans are prepaid prior to the expiration date of the Interest Period applicable thereto, the Borrowers shall pay to the Lenders the amounts described in Section 4.4.

3.5 Payments by the Borrowers.

(a) All payments to be made by the Borrowers shall be made without set off, recoupment or counterclaim. Except as otherwise expressly provided herein, all payments by the Borrowers shall be made to the Agent for the account of the Lenders, at the account designated by the Agent and shall be made in Dollars and in immediately available funds, no later than 12:00 noon (Houston, Texas time) on the date specified herein. Any payment received by the Agent after such time shall be deemed (for purposes of calculating interest only) to have been received on the following Business Day and any applicable interest shall continue to accrue.

(b) Subject to the provisions set forth in the definition of “Interest Period,” whenever any payment is due on a day other than a Business Day, such payment shall be due on the following Business Day, and such extension of time shall in such case be included in the computation of interest or fees, as the case may be.

3.6 Payments as Revolving Loans. At the election of the Agent, all payments of principal, interest, reimbursement obligations in connection with Letters of Credit and Credit Support, fees, premiums, reimbursable expenses and other sums payable hereunder, may be paid from the proceeds of Revolving Loans made hereunder. The Borrowers hereby irrevocably authorize the Agent to charge the Loan Account for the purpose of paying all amounts from time to time due hereunder (without regard to any grace periods hereunder, including, without limitation, Loans that constitute Agent Advances) and agrees that all such amounts charged shall constitute Revolving Loans (including Non-Ratable Loans and Agent Advances).

3.7 Apportionment, Application and Reversal of Payments. Principal and interest payments shall be apportioned ratably among the Lenders (according to the unpaid principal balance of the Revolving Loans to which such payments relate held by each Lender) and payments of the fees shall, as applicable, be apportioned ratably among the Lenders, except for fees payable solely to the Agent and the Letter of Credit Issuers and except as provided in Section 11.1(b) or 12.14(e). All payments shall be remitted to the Agent and all such payments not relating to principal or interest of specific Loans, or not constituting payment of specific fees, and all proceeds of Accounts or other Collateral received by the

Agent following the occurrence and during the continuation of any Event of Default shall be applied, ratably, subject to the provisions of this Agreement, first, to pay any fees, indemnities, or expense reimbursements then due to the Agent from the Borrowers (other than any fees, indemnities, or expense reimbursements arising under any Bank Product); second, to pay any fees or expense reimbursements then due to the Lenders from the Borrowers (other than any fees or expense arising from any Bank Product); third, to pay interest due in respect of all Loans, including Non-Ratable Loans and Agent Advances; fourth, to pay or prepay principal of the Non-Ratable Loans and Agent Advances; fifth, to pay or prepay principal of the Revolving Loans (other than Non-Ratable Loans and Agent Advances), unpaid reimbursement obligations in respect of Letters of Credit, and Pari Passu Bank Product Obligations; sixth, to pay an amount to the Agent equal to all outstanding Letter of Credit Obligations to be held as cash collateral for such Obligations; and seventh, to the payment of any other Obligations including any amounts relating to Bank Products due to the Agent, any Lender, or their respective Affiliates by the Borrowers that are not Pari Passu Bank Product Obligations. Notwithstanding anything to the contrary contained in this Agreement, unless so directed by the Borrowers, or unless an Event of Default has occurred and is continuing, neither the Agent nor any Lender shall apply any payments which it receives to any LIBOR Rate Loan, except (a) on the expiration date of the Interest Period applicable to any such LIBOR Rate Loan, or (b) in the event, and only to the extent, that there are no outstanding Base Rate Loans and, in any event, the Borrowers shall pay LIBOR breakage losses in accordance with Section 4.4. To the extent not inconsistent with the express terms of this Agreement, the Agent and the Lenders shall have the continuing and exclusive right to apply and reverse and reapply any and all such proceeds and payments to any portion of the Obligations.

3.8 Indemnity for Returned Payments. If after receipt of any payment which is applied to the payment of all or any part of the Obligations, the Agent, any Lender, the Bank or any Affiliate of the Bank is for any reason compelled to surrender such payment or proceeds to any Person because such payment or application of proceeds is invalidated, declared fraudulent, set aside, determined to be void or voidable as a preference, impermissible setoff, or a diversion of trust funds, or for any other reason, then the Obligations or part thereof intended to be satisfied shall be revived and continued and this Agreement shall continue in full force as if such payment or proceeds had not been received by the Agent or such Lender and the Borrowers shall be liable to pay to the Agent and the Lenders, and hereby do indemnify the Agent and the Lenders and hold the Agent and the Lenders harmless for the amount of such payment or proceeds surrendered. The provisions of this Section 3.8 shall be and remain effective notwithstanding any contrary action which may have been taken by the Agent or any Lender in reliance upon such payment or application of proceeds, and any such contrary action so taken shall be without prejudice to the Agent’s and the Lenders’ rights under this Agreement and shall be deemed to have been conditioned upon such payment or application of proceeds having become final and irrevocable. The provisions of this Section 3.8 shall survive the termination of this Agreement.

3.9 Agent’s and Lenders’ Books and Records; Monthly Statements. The Agent shall record the principal amount of the Revolving Loans owing to each Lender, the undrawn face amount of all outstanding Letters of Credit and the aggregate amount of unpaid reimbursement obligations outstanding with respect to the Letters of Credit from time to time on its books. In addition, each Lender may note the date and amount of each payment or prepayment of principal of such Lender’s Loans in its books and records. Failure by the Agent or any Lender to make such notation shall not affect the obligations of the Borrowers with respect to the Revolving Loans or the Letters of Credit. Each Borrower agrees that the Agent’s and each Lender’s books and records showing the Obligations and the transactions pursuant to this Agreement and the other Loan Documents shall be admissible in any action or proceeding arising therefrom, and shall constitute rebuttably presumptive proof thereof, absent manifest error, irrespective of whether any Obligation is also evidenced by a promissory note or other instrument. The Agent will provide to the Borrowers a monthly statement of Revolving Loans, payments, and other transactions pursuant to this Agreement. Such statement shall be deemed correct, accurate, and binding

on the Borrowers and an account stated (except for reversals and reapplications of payments made as provided in Section 3.7 and corrections of errors discovered by the Agent), unless the Borrowers notify the Agent in writing to the contrary within thirty (30) days after such statement is received. In the event a timely written notice of objections is given by the Borrowers, only the items to which exception is expressly made will be considered to be disputed by the Borrowers.

ARTICLE 4.

TAXES, YIELD PROTECTION AND ILLEGALITY

4.1 Taxes.

(a) Any and all payments by any Loan Party on account of any Obligations shall be made free and clear of and without reduction or withholding for any Indemnified Taxes or Other Taxes, provided that if a Loan Party or the Agent shall be required by the applicable law to deduct any Indemnified Taxes (including any Other Taxes) from such payments, then (i) the sum payable shall be increased as necessary so that after making all required deductions (including deductions applicable to additional sums payable under this Section), the Agent, any Lender or any Letter of Credit Issuer, as the case may be, receives an amount equal to the sum it would have received had no such deductions been made; (ii) the applicable Loan Party or the Agent shall make such deductions; and (iii) the applicable Loan Party or the Agent shall timely pay the full amount deducted to the relevant Governmental Authority in accordance with Requirement of Law. Without limiting the foregoing, the applicable Loan Party shall timely pay all Other Taxes to the relevant Governmental Authorities.

(b) The Borrowers shall indemnify, hold harmless and reimburse the Agent, the Lenders, and any Letter of Credit Issuer, within ten (10) days after demand therefor, for the full amount of any Indemnified Taxes or Other Taxes (including Indemnified Taxes or Other Taxes imposed or asserted on or attributable to amounts payable under this Section) paid by the Agent, any Lender or any Letter of Credit Issuer with respect to any Obligations, Letters of Credit or Loan Documents, and any reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes or Other Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. A certificate setting forth in reasonable detail (without disclosing any business or confidential information) the calculation of the amount of such payment or liability delivered to Westlake by a Lender or any Letter of Credit Issuer (with a copy to the Agent), or by the Agent, shall be conclusive absent manifest error. As soon as practicable after any payment of Indemnified Taxes or Other Taxes by a Borrower, Westlake shall deliver to the Agent a receipt issued by the Governmental Authority evidencing such payment or other evidence of payment satisfactory to Agent. Notwithstanding anything to the contrary in this Agreement, the Loan Parties shall not indemnify any Person for Excluded Taxes.

(c) Any Foreign Lender that is entitled to an exemption from or reduction of withholding tax under the law of the jurisdiction in which a Loan Party is resident for tax purposes, or any treaty to which such jurisdiction is a party, with respect to payments under any Loan Document shall promptly deliver to the Agent and Westlake, at the time or times prescribed by Requirement of Law or reasonably requested by the Agent or Westlake, such properly completed and executed documentation prescribed by Requirement of Law as will permit such payments to be made without withholding or at a reduced rate of withholding. In addition, any Lender, if requested by the Agent or Westlake, shall promptly deliver such other documentation prescribed by Requirement of Law or reasonably requested by the Agent or Westlake as will enable the Agent and Westlake to determine whether or not such Lender is subject to backup withholding or information reporting requirements.

(d) Without limiting the generality of the foregoing, if a Borrower is resident for tax purposes in the United States, (i) any Lender that is a “United States person” within the meaning of Section 7701(a)(30) of the Code shall deliver to the Agent and Westlake, on or prior to the date on which such Lender becomes a Lender hereunder, duly completed copies of a then effective IRS Form W-9 or such other documentation or information prescribed by Requirement of Law or reasonably requested by the Agent or Westlake to determine whether or not such Lender is subject to backup withholding or information reporting requirements; (ii) a Foreign Lender shall deliver to the Agent and Westlake on or prior to the date on which such Foreign Lender becomes a Lender hereunder, whichever of the following is applicable: (A) duly completed copies of a then effective IRS Form W-8BEN claiming eligibility for benefits of an income tax treaty to which the United States is a party; (B) duly completed copies of a then effective IRS Form W-8ECI; (C) duly completed copies of a then effective IRS Form W-8IMY and all required supporting documents; (D) in the case of a Foreign Lender claiming the benefits of the exemption for portfolio interest under section 881(c) of the Code, (1) a certificate to the effect that such Foreign Lender is not (x) a “bank” within the meaning of section 881(c)(3)(A) of the Code, (y) a “10 percent shareholder” of any Obligor within the meaning of section 881(c)(3)(B) of the Code, or (z) a “controlled foreign corporation” described in section 881(c)(3)(C) of the Code, and (2) duly completed copies of a then effective IRS Form W-8BEN; or (E) any other form prescribed by Requirement of Law as a basis for claiming exemption from or a reduction in United States federal withholding tax, duly completed together with such supplementary documentation as may be prescribed by Requirement of Law to permit Borrowers to determine the withholding or deduction required to be made; and (iii) if a payment made to a Lender under any Loan Document would be subject to U.S. federal withholding Tax imposed by FATCA if such Lender were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471(b) or 1472(b) of the Code, as applicable), such Lender shall deliver to Westlake and the Agent at the time or times prescribed by law and at such time or times reasonably requested by Westlake or the Agent such documentation prescribed by applicable Requirement of Law (including as prescribed by Section 1471(b)(3)(C)(i) of the Code) and such additional documentation reasonably requested by Westlake or the Agent as may be necessary for Westlake and the Agent to comply with their obligations under FATCA and to determine that such Lender has complied with such Lender’s obligations under FATCA or to determine the amount to deduct and withhold from such payment. Solely for purposes of this clause (d)(iii), “FATCA” shall include any amendments made to FATCA after the date of this Agreement.

(e) Each Lender and each Letter of Credit Issuer shall promptly notify Westlake and the Agent of any change in circumstances that would change any claimed exemption or reduction or otherwise render the documentation provided under Section 4.1(d) obsolete or inaccurate in any material respect and shall, promptly upon reasonable request by the Agent or Westlake, provide updated documentation under Section 4.1(d). Each Lender and each Letter of Credit Issuer shall indemnify, hold harmless and reimburse (within ten (10) days after demand therefor) the Loan Parties and the Agent for any Taxes, losses, claims, liabilities, penalties, interest and expenses (including reasonable attorneys’ fees) incurred by or asserted against a Loan Party or the Agent by any Governmental Authority due to such Lender’s or such Letter of Credit Issuer’s failure to deliver, or inaccuracy or deficiency in, any documentation required to be delivered by it pursuant to this Section. Each Lender and each Letter of Credit Issuer authorizes the Agent to set off any amounts due to the Agent under this Section against any amounts payable to such Lender or such Letter of Credit Issuer under any Loan Document. This Section shall survive Full Payment of the Obligations, or any resignation or replacement of the Agent, any Lender, or any Letter of Credit Issuer.

(f) If the Agent, any Lender, or any Letter of Credit Issuer determines, in its sole discretion, that it has received a refund of any Taxes or Other Taxes as to which it has been indemnified by a Loan Party, or with respect to which a Loan Party has paid additional amounts pursuant to this Section, it shall pay to such Loan Party an amount equal to such refund (but only to the extent of indemnity payments made, or additional amounts paid, by such Loan Party under this Section with respect to the Taxes or Other Taxes giving rise to such refund), net of all out-of-pocket expenses of the Agent, such Lender, or such Letter of Credit Issuer, as the case may be, and without interest (other than any interest paid by the relevant Governmental Authority with respect to such refund), provided that such Loan Party, upon the request of the Agent, such Lender, or such Letter of Credit Issuer, agrees to repay the amount paid over to such Loan Party (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) to the Agent, such Lender, or such Letter of Credit Issuer if the Agent, such Lender, or such Letter of Credit Issuer is required to repay such refund to such Governmental Authority. This subsection shall not be construed to require the Agent, any Lender, or any Letter of Credit Issuer to make available its tax returns (or any other information relating to its taxes that it deems confidential) to any Loan Party or any other Person.

4.2 Illegality.

(a) If any Lender determines that the introduction of any Requirement of Law, or any change in any Requirement of Law, or in the interpretation or administration of any Requirement of Law, has made it unlawful, or that any central bank or other Governmental Authority has asserted that it is unlawful, for any Lender or its applicable lending office to make LIBOR Rate Loans, then, on notice thereof by that Lender to the Borrowers through the Agent together with an explanation of the circumstances, any obligation of that Lender to make LIBOR Rate Loans shall be suspended until that Lender notifies the Agent and the Borrowers that the circumstances giving rise to such determination no longer exist.

(b) If a Lender determines that it is unlawful to maintain any LIBOR Rate Loan, the Borrowers shall, upon its receipt of notice of such fact and demand from such Lender (with a copy to the Agent), prepay in full such LIBOR Rate Loans of that Lender then outstanding, together with interest accrued thereon and amounts required under Section 4.4, either on the last day of the Interest Period thereof, if that Lender may lawfully continue to maintain such LIBOR Rate Loans to such day, or immediately, if that Lender may not lawfully continue to maintain such LIBOR Rate Loans and if applicable convert to Base Rate Loans. If the Borrowers are required to so prepay any LIBOR Rate Loans, then concurrently with such prepayment, the Borrowers shall borrow from the affected Lender, in the amount of such prepayment, a Base Rate Loan.

4.3 Increased Costs; Capital Adequacy.

(a) Change in Law. If any Change in Law shall:

(i) impose, modify or deem applicable any reserve, special deposit, compulsory loan, insurance charge or similar requirement against assets of, deposits with or for the account of, or credit extended or participated in by, any Lender (except any reserve requirement reflected in LIBOR Rate) or any Letter of Credit Issuer;

(ii) subject any Lender or any Letter of Credit Issuer to any Tax with respect to any Revolving Loan, Loan Document, Letter of Credit, Credit Support or participation in Letters of Credit or Credit Support, or change the basis of taxation of payments to such

Lender or such Letter of Credit Issuer in respect thereof (except for Indemnified Taxes or Other Taxes covered by Section 4.1 and the imposition of, or any change in the rate of, any Excluded Tax payable by, or imposed with respect to payments to, such Lender or such Letter of Credit Issuer); or

(iii) impose on any Lender or any Letter of Credit Issuer or the London interbank market any other condition, cost, or expense affecting any Revolving Loan, Loan Document, Letter of Credit, Credit Support, participation in Letters of Credit or Credit Support, or Commitment;

and the result thereof shall be to increase the cost to such Lender of making or maintaining any LIBOR Rate Loan or Commitment, or to increase the cost to such Lender or such Letter of Credit Issuer of participating in, issuing or maintaining any Letter of Credit or Credit Support, or to reduce the amount of any sum received or receivable by such Lender or such Letter of Credit Issuer hereunder (whether of principal, interest or any other amount) then, upon request of such Lender or such Letter of Credit Issuer, the Borrowers will, within ten (10) days of receipt of the certificate delivered by the Agent under Section 4.6, pay to such Lender or such Letter of Credit Issuer, as applicable, such additional amount or amounts as will compensate such Lender or such Letter of Credit Issuer, as applicable, for such additional costs incurred or reduction suffered.

(b) Capital Adequacy. If any Lender or any Letter of Credit Issuer determines that any Change in Law affecting such Lender or such Letter of Credit Issuer or any Lending Office of such Lender or such Lender’s or such Letter of Credit Issuer’s holding company, if any, regarding capital requirements has or would have the effect of reducing the rate of return on such Lender’s, such Letter of Credit Issuer’s or holding company’s capital as a consequence of this Agreement, or such Lender’s or such Letter of Credit Issuer’s Commitments, Revolving Loans, Letters of Credit, Credit Support, or participations in Letters of Credit or Credit Support, to a level below that which such Lender, such Letter of Credit Issuer or holding company could have achieved but for such Change in Law (taking into consideration such Lender’s, such Letter of Credit Issuer’s and holding company’s policies with respect to capital adequacy), then from time to time the Borrowers will pay to such Lender or such Letter of Credit Issuer, as the case may be, such additional amount or amounts as will compensate it or its holding company for any such reduction suffered, in each case, within ten (10) days of receipt of the certificate delivered under Section 4.6.

4.4 Funding Losses. If for any reason (other than default by a Lender) (a) any Borrowing of, or conversion to or continuation of, a LIBOR Rate Loan does not occur on the date specified therefor in a Notice of Borrowing or Notice of Conversion/Continuation (whether or not withdrawn), (b) any repayment or conversion of a LIBOR Rate Loan occurs on a day other than the end of its Interest Period, (c) the Borrowers fail to repay a LIBOR Rate Loan when required hereunder, or (d) a Lender (other than a Defaulting Lender) is required to assign a LIBOR Rate Loan prior to the end of its Interest Period pursuant to Section 4.9, then the Borrowers shall, within ten (10) days of receipt of the certificate delivered under Section 4.6, pay to the Agent its customary administrative charge and to each Lender all losses and expenses that it sustains as a consequence thereof, including any loss or expense arising from liquidation or redeployment of funds or from fees payable to terminate deposits of matching funds. Lenders shall not be required to purchase Dollar deposits in the London interbank market or any other offshore Dollar market to fund any LIBOR Rate Loan, but the provisions hereof shall be deemed to apply as if each Lender had purchased such deposits to fund its LIBOR Rate Loans.

4.5 Inability to Determine Rates. If Required Lenders notify the Agent for any reason in connection with a request for a Borrowing of, or conversion to or continuation of, a LIBOR Rate Loan

that (a) Dollar deposits are not being offered to banks in the London interbank Eurodollar market for the applicable amount and Interest Period of such Loan, (b) adequate and reasonable means do not exist for determining LIBOR Rate for the requested Interest Period, or (c) LIBOR Rate for the requested Interest Period does not adequately and fairly reflect the cost to such Lenders of funding such Revolving Loan, then the Agent will promptly so notify Westlake and each Lender. Thereafter, the obligation of Lenders to make or maintain LIBOR Rate Loans shall be suspended until the Agent (upon instruction by Required Lenders) revokes such notice. Upon receipt of such notice, Westlake may revoke any pending request for a Borrowing of, conversion to or continuation of a LIBOR Rate Loan or, failing that, will be deemed to have submitted a request for a Base Rate Loan.

4.6 Certificates of the Agent. If any Lender or any Letter of Credit Issuer claims reimbursement or compensation under this Article 4, the Agent shall determine the amount thereof and shall deliver to the Borrowers (with a copy to the affected Lender) a certificate setting forth in reasonable detail the amount payable to the affected Lender, and such certificate shall be conclusive and binding on the Borrowers in the absence of manifest error.

4.7 Delay in Requests. Failure or delay on the part of any Lender or any Letter of Credit Issuer to demand compensation pursuant to this Section shall not constitute a waiver of its right to demand such compensation, but the Borrowers shall not be required to compensate a Lender or a Letter of Credit Issuer for any increased costs incurred or reductions suffered more than nine (9) months prior to the date that a Lender or a Letter of Credit Issuer notifies Westlake of the Change in Law giving rise to such increased costs or reductions and of such Lender’s or such Letter of Credit Issuer’s intention to claim compensation therefor (except that, if the Change in Law giving rise to such increased costs or reductions is retroactive, then the nine-month period referred to above shall be extended to include the period of retroactive effect thereof).

4.8 Mitigation. If any Lender or any Letter of Credit Issuer gives a notice under Section 4.2 or requests compensation under Section 4.3, or if the Loan Parties are required to pay additional amounts with respect to a Lender under Section 4.1, then such Lender shall use reasonable efforts to designate a different Lending Office or to assign its rights and obligations hereunder to another of its offices, branches or Affiliates, if, in the judgment of such Lender, such designation or assignment (a) would eliminate the need for such notice or reduce amounts payable in the future, as applicable; and (b) in each case, would not subject such Lender to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender. The Borrowers agree to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment.

4.9 Replacement of Lenders. If any Lender requests compensation under Section 4.3, or if the Borrowers are required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to Section 4.1, or if any Lender gives notice under Section 4.2, at the Borrowers’ request, the Agent or an Eligible Assignee shall have the right (but not the obligation) with the Agent’s approval, to purchase from such Lender, and such Lender agrees that it shall sell, all its Commitments for an amount equal to the principal balances thereof and all accrued interest and fees with respect thereto through the date of sale pursuant to Assignment and Acceptance, without premium or discount. The Agent is irrevocably appointed as attorney-in-fact to execute any such Assignment and Acceptance if such Lender fails to execute same within twenty (20) days of such request of assignment. Such Lender shall be entitled to receive, in cash, concurrently with such assignment, all amounts owed to it under the Loan Documents, including all principal, interest and fees through the date of assignment (but excluding any prepayment charge).

4.10 Survival. The agreements and obligations of the Borrowers in this Article 4 shall survive the payment of all other Obligations.

ARTICLE 5.

BOOKS AND RECORDS; FINANCIAL INFORMATION; NOTICES

5.1 Books and Records. The Loan Parties shall maintain, at all times, correct and complete books, records and accounts in which entries that are complete, correct and timely in all material respects are made of their respective transactions in accordance with GAAP applied consistently with the audited Financial Statements required to be delivered pursuant to Section 5.2(a) (it being understood and agreed that certain Foreign Subsidiaries maintain individual books and records in conformity with generally accepted accounting principles in their respective countries of organization and that such maintenance shall not constitute a breach of the representations, warranties, or covenants hereunder). The Loan Parties shall, by means of appropriate entries, reflect in such accounts and in all Financial Statements proper liabilities and reserves for all taxes and proper provision for depreciation and amortization of property and bad debts, all in accordance with GAAP. The Loan Parties shall maintain at all times books and records pertaining to the Collateral in such detail, form and scope as the Agent or any Lender shall reasonably require, including, but not limited to, records of (a) all payments received and all credits and extensions granted with respect to the Accounts; (b) the return, rejection, repossession, stoppage in transit, loss, damage, or destruction of any Inventory; and (c) all other dealings affecting the Collateral.

5.2 Financial Information. The Borrowers shall promptly furnish to the Agent, all such financial information regarding the Loan Parties as the Agent shall reasonably request. Without limiting the foregoing, the Borrowers will furnish to the Agent, in such detail as the Agent or the Lenders shall request in their reasonable discretion, the following:

(a) As soon as available, but in any event not later than ninety (90) days after the close of each Fiscal Year, consolidated audited and consolidating unaudited balance sheets, and income statements, cash flow statements and changes in stockholders’ equity for Westlake and its Subsidiaries for such Fiscal Year, and the accompanying notes thereto, setting forth in each case in comparative form figures for the previous Fiscal Year, all in reasonable detail, fairly presenting in all material respects the financial position and the results of operations of Westlake and its Subsidiaries as at the date thereof and for the Fiscal Year then ended, and prepared in accordance with GAAP. Such statements shall be examined in accordance with generally accepted auditing standards by and, in the case of such statements performed on a consolidated basis, accompanied by a report of, independent certified public accountants of recognized national standing selected by the Borrowers, which is not qualified with respect to scope limitations imposed by any Loan Party, with respect to accounting principles followed by any Loan Party not in accordance with GAAP, or with respect to a “going concern” or similar nature. Westlake, simultaneously with retaining such independent public accountants to conduct such annual audit, shall send a letter to such accountants, with a copy to the Agent and the Lenders, notifying such accountants that one of the primary purposes for retaining such accountants’ services and having audited financial statements prepared by them is for use by the Agent and the Lenders. The Borrowers hereby authorize the Agent to communicate directly with their certified public accountants and, by this provision, authorizes those accountants to disclose to the Agent any and all financial statements and other supporting financial documents and schedules relating to the Loan Parties and to discuss directly with the Agent the finances and affairs of the Loan Parties. The Agent shall give Westlake the opportunity to participate in any discussions with its accountants.

(b) As soon as available, but in any event not later than (i) forty-five (45) days after the last day of the first three fiscal quarters of each Fiscal Year and (i) sixty (60) days after the last day of the fourth fiscal quarter of each Fiscal Year, consolidated and consolidating unaudited balance sheets and income statements, and consolidated cash flow statements and changes in stockholders’ equity, for Westlake and its Subsidiaries for such fiscal quarter and for the period

from the beginning of the then-current fiscal year to, such last day. The Borrowers shall certify by a certificate signed by a Responsible Officer of Westlake that all such statements have been prepared in accordance with GAAP and present fairly in all material respects the financial position of Westlake and its Subsidiaries as at the dates thereof and its results of operations for the periods then ended, subject to normal year-end adjustments and the absence of applicable footnotes.

(c) As soon as available, but in any event not later than (i) thirty (30) days after the end of each month other than March, June, September or December and (ii) forty-five (45) days after the end of each March, June, September and December, consolidated unaudited balance sheets of Westlake and its Subsidiaries as at the end of such month, and consolidated unaudited income statements and cash flow statements for Westlake and its Subsidiaries for such month and for the period from the beginning of the Fiscal Year to the end of such month, all in reasonable detail, fairly presenting in all material respects the financial position and results of operations of Westlake and its Subsidiaries as at the date thereof and for such periods, and prepared in accordance with GAAP (except for the inclusion of necessary footnotes) applied consistently with the audited Financial Statements required to be delivered pursuant to Section 5.2(a). Notwithstanding the foregoing, the financial statements required to be delivered pursuant to this clause (c) shall be required to be delivered for a particular month only if the Availability is less than or equal to the greater of (i) 25% of the Maximum Revolver Amount and (ii) $100,000,000 at any time during such month.

(d) With each of the audited Financial Statements delivered pursuant to Section 5.2(a), a certificate of the independent certified public accountants that examined such statement to the effect that they have reviewed and are familiar with this Agreement and that, in examining such Financial Statements, they did not become aware of any fact or condition which then constituted a Default or Event of Default with respect to Section 7.21, except for those, if any, described in reasonable detail in such certificate.

(e) As soon as available, but in any event not later than (i) thirty (30) days after the end of each month other than March, June, September or December and (ii) forty-five (45) days after the end of each March, June, September and December, a Compliance Certificate in the form of Exhibit G from a Responsible Officer on behalf of the Loan Parties stating that, among other things, except as explained in reasonable detail in such certificate, (A) all of the representations and warranties of the Loan Parties contained in this Agreement and the other Loan Documents are correct and complete in all material respects as at the date of such certificate as if made at such time, except for those that speak as of a particular date, (B) the Loan Parties are, at the date of such certificate, in compliance in all material respects with all of its respective covenants and agreements in this Agreement and the other Loan Documents, and (C) no Default or Event of Default then exists or existed during the period covered by the Financial Statements and at the end of such period, together with a schedule setting forth in reasonable detail the calculation of the Fixed Charge Coverage Ratio for the immediately preceding twelve (12) month period. If such certificate discloses that a representation or warranty is not correct or complete, or that a covenant has not been complied with, or that a Default or Event of Default existed or exists, such certificate shall set forth what action the Borrowers have taken or propose to take with respect thereto.

(f) Within thirty (30) days after the beginning of each Fiscal Year, annual forecasts (to include forecasted consolidated, as well as consolidating by business segment in accordance with Westlake’s customary practices, balance sheets, income statements and cash flow statements) for Westlake and its Subsidiaries as at the end of and for each fiscal month of such Fiscal Year.

(g) Promptly upon the filing thereof, copies of all reports, if any, or other documents filed by any Loan Party with the SEC under the Exchange Act, and all reports, notices, or statements sent or received by any Loan Party to or from the holders of any of the Bond Debt or other Debt of any Loan Party registered under the Securities Act of 1933 or to or from the trustee under any indenture under which the same is issued, other than non-material disclosures; provided that the Loan Parties shall file with the SEC all Material Agreements in accordance with applicable Requirements of Law.

(h) As soon as available, but in any event not later than fifteen (15) days after any Borrower’s receipt thereof, a copy of any management letters prepared for any Borrower by any independent certified public accountants of the Borrowers in connection with the audited Financial Statements of the Loan Parties for any Fiscal Year.

(i) If requested by the Agent, promptly after filing with the IRS, a copy of each tax return filed by any Loan Party.

(j) A Borrowing Base Certificate prepared as of the end of each fiscal quarter, to be delivered as soon as available, but in any event within fifteen (15) days after the end of such fiscal quarter; provided that, if the Average Daily Availability during any month in such fiscal quarter or in the prior fiscal quarter exceeds the greater of: (x) 12.5% of the Maximum Revolver Amount and (y) $50,000,000 but is less than or equal to the greater of (x) 75% of the Maximum Revolver Amount and (y) $300,000,000, a Borrowing Base Certificate prepared as of the end of such month and each subsequent month until all three months in any subsequent fiscal quarter exceeds the greater of (x) 75% of the Maximum Revolver Amount and (y) $300,000,000, such Borrowing Base Certificate to be delivered as soon as available, but in any event within fifteen (15) days after the end of each such month; provided further that, if the Average Daily Availability during any month is less than or equal to the greater of (x) 12.5% of the Maximum Revolver Amount and (y) $50,000,000, a Borrowing Base Certificate prepared as of the end of each subsequent week and until the Average Daily Availability during any subsequent month exceeds the greater of (x) 12.5% of the Maximum Revolver Amount and (y) $50,000,00, such Borrowing Base Certificate to be delivered as soon as available, but in any event within three (3) days after the end of each such week. Notwithstanding the foregoing, the Borrowers may deliver a Borrowing Base Certificate more frequently to determine Availability or otherwise.

(k) (i) a detailed aged trial balance of all Accounts as of the end of each fiscal quarter, specifying each Account’s Account Debtor name and address, amount, invoice date and due date, showing any discount, allowance, credit, authorized return or dispute, and including such proof of delivery, copies of invoices and invoice registers, copies of related documents, repayment histories, status reports and other information as the Agent may reasonably request, and (ii) an inventory and reconciliation reports in form satisfactory to the Agent, in each case to be delivered as soon as available after such fiscal quarter end, but in any event within fifteen (15) days after the end of such fiscal quarter; provided that, if the Average Daily Availability for any month in such fiscal quarter or the prior fiscal quarter does not exceed the greater of (x) 75% of the Maximum Revolver Amount and (y) $300,000,000, the reports and other information required to be delivered pursuant to this Section 5.2(k) shall be prepared as of the end of each month until the Average Daily Availability for all three months in any subsequent fiscal quarter exceeds the greater of (x) 75% of the Maximum Revolver Amount and (y) $300,000,000, such reports and other information to be delivered not later than fifteen (15) days after the end of each such month.

(l) At the request of the Agent and the expense of the Borrowers, Inventory appraisals to be performed by an appraisal company acceptable to the Agent; provided that (i) no Inventory appraisal shall be required for any year in which the Availability exceeds the greater of (x) 60% of the Maximum Revolver Amount and (y) $240,000,000 at all times during such period, provided that Availability may be less than or equal to the foregoing amount for no more than five (5) consecutive Business Days if it is more than the greater of (x) 55% of the Maximum Revolver Amount and (y) $220,000,000 at all times during such period; (ii) two (2) Inventory appraisals shall be required for each year in which the Availability is less than or equal to the greater of (x) 20% of the Maximum Revolver Amount and (y) $80,000,000 for more than five (5) consecutive Business Days during such period, or is less than the greater of (x) 15% of the Maximum Revolver Amount and (y) $60 million at any time during such period; and (iii) one (1) Inventory appraisal shall be required for any other year; provided that the Agent may request Inventory appraisals to be performed at any time a Default or an Event of Default exists. In addition to any Inventory appraisal required pursuant to the foregoing, the Agent is entitled, at the expense of the Borrowers, to cause an Inventory appraisal to be performed by an appraisal company acceptable to the Agent within ninety (90) days of the Closing Date; provided that in the event the Agent requests such appraisal to be performed, the Aggregate Revolver Outstanding may not exceed $50,000,000 at any time until the Agent has received the Inventory appraisal in form and substance acceptable to the Agent.

(m) Such additional information (including, without limitation, copies of any Material Agreement) as the Agent and/or any Lender may from time to time reasonably request regarding the financial and business affairs of Westlake or any of its Subsidiaries.

(n) Documents required to be delivered pursuant to Section 5.2(a), (b) or (g) (to the extent any such documents are included in materials otherwise filed with the SEC) may be delivered electronically and if so delivered, shall be deemed to have been delivered on the date (i) on which the Borrowers post such documents, or provide a link thereto on Westlake’s website on the Internet at the website address ▇▇▇.▇▇▇▇▇▇▇▇.▇▇▇; or (ii) on which such documents are posted on the Borrowers’ behalf on an Internet or intranet website, if any, to which each Lender and the Agent have access (whether a commercial, third-party website or whether sponsored by the Agent); provided that: (i) the Borrowers shall deliver paper copies of such documents to the Agent or any Lender that requests the Borrowers to deliver such paper copies until a written request to cease delivering paper copies is given by the Agent or such Lender and (ii) the Borrowers shall notify the Agent and each Lender (by telecopier or electronic mail) of the posting of any such documents and provide to the Agent by electronic mail electronic versions (i.e., soft copies) of such documents. The Agent shall have no obligation to request the delivery or to maintain copies of the documents referred to above, and in any event shall have no responsibility to monitor compliance by the Borrowers with any such request for delivery, and each Lender shall be solely responsible for requesting delivery to it or maintaining its copies of such documents.

The Borrowers hereby acknowledge that the Agent and/or the Arranger will make available to the Lenders and the Letter of Credit Issuers materials and/or information provided by or on behalf of the Borrowers hereunder (collectively, “Borrower Materials”) by posting the Borrower Materials on IntraLinks or another similar electronic system. The Agent agrees to use its best efforts in accordance with its standard business practices to post the Borrower Materials to IntraLinks or another similar electronic system. The Agent shall have no liability to the Lenders or the Borrowers for any failure to post the Borrower Materials to IntraLinks or another similar electronic system.

5.3 Notices to the Agent. The Borrowers shall notify the Agent in writing of the following matters at the following times:

(a) Promptly after any Responsible Officer of any Loan Party becoming aware of any Default or Event of Default;

(b) Promptly after any Responsible Officer of any Loan Party becoming aware of the assertion by the holder of any capital stock of any Loan Party or the holder of any Debt of any Loan Party in a face amount in excess of $20,000,000 that a default exists with respect thereto or that such Loan Party is not in compliance with the terms thereof, or the threat or commencement by such holder of any enforcement action because of such asserted default or non-compliance;

(c) Promptly after any Responsible Officer of any Loan Party becoming aware of any event or circumstance which could reasonably be expected to have a Material Adverse Effect;

(d) Promptly after any Responsible Officer of any Loan Party becoming aware of any pending or threatened action, suit, or proceeding, by any Person, or any pending or threatened investigation by a Governmental Authority, which could reasonably be expected to have a Material Adverse Effect;

(e) Promptly after any Responsible Officer of any Loan Party becoming aware of any pending or threatened strike, work stoppage, unfair labor practice claim, or other labor dispute affecting the any Loan Party in a manner which could reasonably be expected to have a Material Adverse Effect;

(f) Promptly after any Responsible Officer of any Loan Party becoming aware of any violation of any law, statute, regulation, or ordinance of a Governmental Authority affecting any Loan Party which could reasonably be expected to have a Material Adverse Effect;

(g) Promptly after receipt by a Responsible Officer of any Loan Party of (i) any notice of any violation by any Loan Party of any Environmental Law or (ii) any writing from any Governmental Authority asserting that (x) any Loan Party is not in compliance with any Environmental Law or (y) any Loan Party is being investigated for its compliance with the Environmental Law, provided that any such violation, noncompliance or investigation could reasonably be expected to have a Material Adverse Effect;

(h) Promptly after receipt by any Responsible Officer of any Loan Party of any written notice that the any Loan Party is or may be liable to any Person as a result of the Release or threatened Release of any Contaminant or that any Loan Party is subject to investigation by any Governmental Authority evaluating whether any remedial action is needed to respond to the Release or threatened Release of any Contaminant which, in either case, is reasonably likely to give rise to liability in excess of $20,000,000;

(i) Promptly after receipt by a Responsible Officer of any Loan Party of any written notice of the imposition of any Environmental Lien against any property of any Loan Party securing an amount which could reasonably be expected to exceed $20,000,000;

(j) (i) Any change in any Loan Party’s name as it appears in the state of its incorporation or other organization, state of incorporation or organization, type of entity, organizational identification number, form of organization, trade names under which any Loan Party will sell Inventory or create Accounts, or to which instruments in payment of Accounts may

be made payable, in each case at least thirty (30) days prior thereto (or such shorter period as agreed to by the Agent in its sole discretion); and (ii) any additional manufacturing facility, warehouse, storage facility, or customer or vendor locations where Collateral is located (other than Collateral in transit), which information shall be updated monthly or quarterly, as applicable, and included in the monthly or quarterly reports, as applicable, prescribed in Section 5.2(k);

(k) Within ten (10) Business Days after a Responsible Officer of any Loan Party or any ERISA Affiliate knows or has reason to know, that an ERISA Event, or a prohibited transaction (as defined in Sections 406 of ERISA and 4975 of the Code), which could reasonably be expected to result in liability to any Loan Party in excess of $15,000,000 has occurred, and, when known, any action taken or threatened by the IRS, the DOL, or the PBGC with respect thereto;

(l) Promptly after request, or, in the event that such filing reflects a potentially adverse significant financial change with respect to the matters covered thereby, within ten (10) Business Days after the filing thereof with the PBGC, the DOL, or the IRS, as applicable, copies of the following: (i) each annual report (form 5500 series), including Schedule B thereto, filed with the PBGC, the DOL, or the IRS with respect to each Plan, (ii) a copy of each funding waiver request filed with the PBGC, the DOL, or the IRS with respect to any Plan and all communications received by any Loan Party or any ERISA Affiliate from the PBGC, the DOL, or the IRS with respect to such request, and (iii) a copy of each other filing or notice filed with the PBGC, the DOL, or the IRS, with respect to each Plan by either any Loan Party or any ERISA Affiliate;

(m) Promptly after request, copies of each actuarial report for any Plan or Multi-employer Plan and annual report for any Multi-employer Plan; and within ten (10) Business Days after receipt thereof by any Loan Party or any ERISA Affiliate, copies of the following: (i) any notices of the PBGC’s intention to terminate a Plan or to have a trustee appointed to administer such Plan; (ii) any unfavorable determination letter from the IRS regarding the qualification of a Plan under Section 401(a) of the Code; or (iii) any notice from a Multi-employer Plan regarding the imposition of withdrawal liability to any Loan Party in excess of $15,000,000;

(n) Within ten (10) Business Days after the occurrence of any failure by any Loan Party or any ERISA Affiliate to make a required installment or any other required payment under Section 412 of the Code on or before the due date for such installment or payment;

(o) Within ten (10) Business Days after any Responsible Officer of any Loan Party or any ERISA Affiliate knows or has reason to know that any of the following events has or will occur which could reasonably be expected to result in liability to any Loan Party in excess of $15,000,000: (i) a Multi-employer Plan has been or will be terminated; (ii) the administrator or plan sponsor of a Multi-employer Plan intends to terminate a Multi-employer Plan; or (iii) the PBGC has instituted or will institute proceedings under Section 4042 of ERISA to terminate a Multi-employer Plan;

(p) Promptly after the Borrowers have notified the Agent of any intention by the Borrowers to treat the Revolving Loans and/or Letters of Credit and related transactions as being a “reportable transaction” (within the meaning of Treasury Regulation Section 1.6011-4), a duly completed copy of IRS Form 8886 or any successor form; or

(q) Within ten (10) Business Days after any Responsible Officer of any Loan Party knows or has reason to know that any Liens for taxes or statutory Liens for taxes, assessments and other governmental charges, in an amount exceeding $5,000,000, may be imposed or assessed against its property, notices of such Liens and the details thereof.

Each notice given under this Section 5.3 shall describe the subject matter thereof in reasonable detail, and shall set forth the action that the Loan Party, its Restricted Subsidiary, or any ERISA Affiliate, as applicable, has taken or proposes to take with respect thereto.

ARTICLE 6.

GENERAL WARRANTIES AND REPRESENTATIONS

Each Borrower (and each other Loan Party by executing an Obligation Guaranty, with respect to such Loan Party) warrants and represents to the Agent and the Lenders that except as hereafter disclosed to and accepted by the Agent and the Required Lenders in writing:

6.1 Authorization, Validity, and Enforceability of this Agreement and the Loan Documents. Each Loan Party has the power and authority to execute, deliver, and perform this Agreement and the other Loan Documents to which it is a party, to incur the Obligations, and to grant to the Agent’s Liens upon and security interests in the Collateral. Each Loan Party has taken all necessary action (including obtaining approval of its stockholders if necessary) to authorize its execution, delivery, and performance of this Agreement and the other Loan Documents to which it is a party. This Agreement and the other Loan Documents to which it is a party have been duly executed and delivered by each Loan Party, and constitute the legal, valid, and binding obligations of each Loan Party, enforceable against each such Loan Party in accordance with their respective terms except as enforceability may be limited by the Federal Bankruptcy Code or by any other state or federal bankruptcy or insolvency act or law and general principles of equity. Each Loan Party’s execution, delivery, and performance of this Agreement and the other Loan Documents to which it is a party do not and will not conflict with, or constitute a violation or breach of, or result in the imposition of any Lien (other than in favor of the Agent) upon the property of such Loan Party or any of its Subsidiaries, by reason of the terms of (a) any contract, mortgage, lease, material agreement, indenture, or instrument to which such Loan Party is a party or which is binding upon it, (b) any Requirement of Law applicable to such Loan Party or any of its Subsidiaries, or (c) the certificate or articles of incorporation or by-laws or the limited liability company or limited partnership agreement of such Loan Party or any of its Restricted Subsidiaries. The Obligations under the Loan Documents are permitted by the applicable supplemental indenture for each Bond Debt.

6.2 Validity and Priority of Security Interest. The provisions of this Agreement, the Collateral Documents, and the other Loan Documents create legal and valid Liens on all the Collateral in favor of the Agent, for the ratable benefit of the Agent and the Lenders, and, upon the filing of all applicable financing statements against the Loan Parties, such Liens shall constitute perfected and continuing Liens on all the Collateral, having priority over all other Liens on the Collateral, except for those Liens identified in clauses (a) and (d) of the definition of Permitted Liens securing all the Obligations, and enforceable against each Loan Party and all third parties.

6.3 Organization and Qualification. Each Loan Party (a) is duly organized or incorporated and validly existing in good standing under the laws of the state of its organization or incorporation, (b) is qualified to do business and is in good standing in the jurisdictions in which qualification is necessary in order for it to own or lease its property and conduct its business, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect, and (c) has all requisite power and authority to conduct its business and to own its property.

6.4 Corporate Name; Prior Transactions. Except as set forth on Schedule 6.4 or as otherwise notified by Westlake to the Agent, no Loan Party has, during the past five (5) years, been

known by or used any other corporate or fictitious name, or been a party to any merger or consolidation, or acquired all or substantially all of the assets of any Person, or acquired any of its property outside of the ordinary course of business.

6.5 Subsidiaries and Affiliates. Except as otherwise notified by Westlake to the Agent, Schedule 6.5 is a correct and complete list of the name and relationship to each Loan Party of each and all of its Subsidiaries and other Affiliates owned, directly or indirectly, by Westlake. No Loan Party has any direct ownership interest in any Subsidiary of any Unrestricted Subsidiary of Westlake.

6.6 Financial Statements and Projections.

(a) The Borrowers have delivered to the Agent and the Lenders the audited balance sheet and related statements of income, retained earnings, cash flows, and changes in stockholders equity for the Loan Parties as of December 31, 2010, accompanied by the report thereon of the Borrowers’ independent certified public accountants, PricewaterhouseCoopers LLP. The Borrowers have also delivered to the Agent and the Lenders the unaudited balance sheet and related statements of income and cash flows for the Loan Parties as of June 30, 2011. All such Financial Statements have been prepared in accordance with GAAP and fairly present in all material respects the financial position of the Loan Parties as at the dates thereof and their results of operations for the periods then ended, subject to normal year-end adjustments as to the June 30, 2011 statements, and the absence of applicable footnotes.

(b) The Latest Projections when submitted to the Lenders as required herein represent the Borrowers’ good faith estimate of the future financial performance of the Loan Parties for the periods set forth therein. The Latest Projections have been prepared on the basis of the assumptions set forth therein, which the Borrowers believe are fair and reasonable in light of current and reasonably foreseeable business conditions at the time submitted to the Lenders.

6.7 Solvency. On the Closing Date, at the time of each Borrowing hereunder, and on the dates of the issuance of any Letters of Credit to be issued hereunder, each Loan Party is (and after giving effect to the transactions contemplated by the Loan Documents, and any incurrence of additional Debt will be) Solvent.

6.8 Real Estate; Leases. Except as terminated or expired in accordance with its terms, (a) each of the leases and subleases of real or personal property held by any Loan Party as lessee or sublessee (other than leases of personal property as to which any Loan Party is lessee or sublessee for which the value of such personal property in the aggregate is less than $5,000,000) is valid and enforceable in accordance with its terms against the Loan Party thereof which is a party thereto and is in full force and effect, and to the best of each Loan Party’s knowledge, no default by any party to any such lease or sublease exists; and (b) each of the leases and subleases of real or personal property held by any Loan Party as lessor, or sublessor is valid and enforceable in accordance with its terms against the Loan Party thereof which is a party thereto and is in full force and effect, and to the best of each Loan Party’s knowledge, no default by any party to any such lease or sublease exists, except in the case of clauses (a) and (b), where such default or non-enforceability could not reasonably be expected to (i) have a Material Adverse Effect or (ii) affect the Agent’s access to any Collateral. Each Loan Party has good and indefeasible title in fee simple to the Real Estate as owned by such Loan Party, or valid leasehold interests in all Real Estate leased by such Loan Party and each Loan Party has good and indefeasible title to all of its other property reflected on the June 30, 2011 Financial Statements delivered to the Agent and the Lenders, except as disposed of in compliance with Section 7.9 and except where failure to have such title could not reasonably be expected to (i) have a Material Adverse Effect or (ii) affect the Agent’s access to any Collateral, free of all Liens except Permitted Liens.

6.9 Proprietary Rights. Schedule 6.9 sets forth a correct and complete list of all of the Proprietary Rights of each Loan Party as of the Closing Date. None of the Proprietary Rights is subject to any licensing agreement or similar arrangement except those which could not reasonably be expected to have a Material Adverse Effect. To the best of each Loan Party’s knowledge, none of the Proprietary Rights of such Loan Party infringes on or conflicts with any other Person’s property, and no other Person’s property infringes on or conflicts with the Proprietary Rights of such Loan Party, except for any such infringement or conflict which could not reasonably be expected to (a) have a Material Adverse Effect, (b) impair any Proprietary Rights constituting Collateral, or (c) adversely affects the Agent’s enforcement of its rights in any Collateral. The Proprietary Rights described on Schedule 6.9 constitute all of the property of such type necessary to the current conduct of the business of each such Loan Party as of the Closing Date. No Proprietary Rights are necessary for the Agent to be able to enforce the Agent’s Liens granted in any Collateral Document in any Inventory or Accounts.

6.10 Trade Names. All trade names or styles under which any Loan Party or any of their Restricted Subsidiaries will sell Inventory or create Accounts, or to which instruments in payment of Accounts may be made payable, as of the Closing Date, are listed on Schedule 6.10.

6.11 Litigation. Except as set forth on Schedule 6.11, there is no pending, or to the best of any Loan Party’s knowledge threatened, action, suit, proceeding, or counterclaim by any Person against any Loan Party, or to the best of any Loan Party’s knowledge, investigation by any Governmental Authority, or any basis for any of the foregoing, which could reasonably be expected to have a Material Adverse Effect.

6.12 Labor Disputes. Except as set forth on Schedule 6.12, as of the Closing Date (a) there is no collective bargaining agreement or other labor contract covering employees of any Loan Party or any of their Restricted Subsidiaries, (b) no such collective bargaining agreement or other labor contract is scheduled to expire during the term of this Agreement, (c) to the best of each Loan Party’s knowledge, no union or other labor organization is seeking to organize, or to be recognized as, a collective bargaining unit of employees of any Loan Party or any of their Restricted Subsidiaries or for any similar purpose, and (d) there is no pending or (to the best of any Loan Party’s knowledge) threatened, strike, work stoppage, material unfair labor practice claim, or other material labor dispute against or affecting any Loan Party or their Restricted Subsidiaries or their employees.

6.13 Environmental Laws. Except as otherwise disclosed on Schedule 6.13 or except as could not reasonably be expected to have a Material Adverse Effect:

(a) The Loan Parties and their Subsidiaries are and have been in compliance with all Environmental Laws.

(b) Each of the Loan Parties and their Subsidiaries have obtained, and have timely filed any renewal applications for, all permits necessary for its current operations under Environmental Laws, and each Loan Party and its Subsidiaries are in compliance with all terms and conditions of such permits, or, when applicable, such applications.

(c) There has been no Release, nor to the best of any Loan Party’s knowledge, any threatened Release, that has resulted in or that could result in: (i) a violation of or obligation under any Environmental Law, including without limitation, notification, deed recordation, or remediation, or (ii) a diminution in value of the Real Estate. The Real Estate has not contained and currently does not contain any underground storage tanks, any polychlorinated biphenyls (PCBs), or any asbestos.

(d) The Loan Parties and their Subsidiaries have not given, nor were they required to give, and have not received, any notice that: (i) the Loan Parties and their Subsidiaries have violated, or are about to violate, any Environmental Law; (ii) there has been a Release, or there is a threat of Release, from the Real Estate; (iii) the Loan Parties and their Subsidiaries may be or are liable, in whole or in part, for the costs of cleaning up, remediating, removing or responding to a Release; or (iv) the Real Estate is subject to a lien in favor of any governmental entity for any liability, costs or damages, under any Environmental Laws arising from, or costs incurred by, such governmental entity in response to a Release. No conditions have existed, currently exist, or are reasonably foreseeable, that would give rise to such a notice.

(e) Neither Loan Parties nor any Subsidiary nor any Real Estate or presently conducted operations, nor any previously owned real property or prior operations, is subject to any enforcement order from or liability agreement with any Governmental Authority or private Person respecting (i) compliance with any Environmental Law or (ii) any potential liabilities and costs or remedial action arising from the Release or threatened Release.

(f) To the best of any Loan Party’s knowledge, none of the present or past operations of the Loan Parties or their Subsidiaries is the subject of any investigation by any Governmental Authority evaluating whether any compliance action is warranted or any remedial action is needed to respond to a Release or threatened Release.

(g) Neither the Loan Parties nor any of their Subsidiaries has entered into any negotiations or settlement agreements with any Person (including the prior owner of its property) imposing material obligations or liabilities on any Loan Party or any of its Subsidiaries with respect to any remedial action in response to the Release of a Contaminant or environmentally related claim.

(h) Neither the Loan Parties nor any of their Subsidiaries have ever disposed of, sent or arranged for the transportation of Hazardous Materials on or from Real Estate or formerly owned real property which, pursuant to CERCLA or any similar or analogous state law, has been placed or is proposed to be paced (by the United States Environmental Protection Agency (“EPA”) or similar state authority) on the “National Priorities List” or similar state list.

(i) Neither the Loan Parties nor any of their Subsidiaries have been identified by EPA, any similar state authority, or any third party, as a potentially responsible party under CERCLA, or any similar or analogous state law, with respect to the Real Estate or any other site currently or formerly owned, operated or used by Loan Parties or their Subsidiaries.

(j) None of the products manufactured, distributed or sold by the Loan Parties or any of their Subsidiaries contain asbestos containing material.

(k) No Environmental Lien has attached to the Real Estate.

6.14 No Violation of Law. Neither any Loan Party nor any of their Subsidiaries is in violation of any Requirement of Law applicable to it which violation could reasonably be expected to have a Material Adverse Effect.

6.15 No Default. Neither any Loan Party nor any of their Restricted Subsidiaries is in default with respect to any note, indenture, loan agreement, mortgage, lease, deed, or other agreement to which such Person is a party or by which it is bound, which default could reasonably be expected to have a Material Adverse Effect.

6.16 ERISA Compliance. Except as specifically disclosed in Schedule 6.16:

(a) Each Plan is in compliance in all material respects with the applicable provisions of ERISA, the Code, and other federal or state law. Each Plan which is intended to qualify under Section 401(a) of the Code has received a favorable determination letter from the IRS or an application for such a letter is currently pending with the IRS with respect thereto or the applicable remedial amendment period has not elapsed and, to the best knowledge of any Loan Party, nothing has occurred which would prevent or cause the loss of such qualification. Each Borrower and each ERISA Affiliate has made all required contributions to any Plan subject to Section 412 of the Code, and no application for a funding waiver or an extension of any amortization period pursuant to Section 412 of the Code has been made with respect to any Plan.

(b) There are no pending or, to the best knowledge of any Borrower, threatened claims (other than ordinary claims for benefits by participants and beneficiaries), actions or lawsuits, or action by any Governmental Authority, with respect to any Plan which has resulted or could reasonably be expected to result in a Material Adverse Effect. There has been no prohibited transaction or violation of the fiduciary responsibility rules with respect to any Plan which has resulted or could reasonably be expected to result in a Material Adverse Effect.

(c) (i) No ERISA Event has occurred within the past five (5) years or is reasonably expected to occur which has or could reasonably be expected to result in liability to any Loan Party in excess of $15,000,000; (ii) the Unfunded Pension Liability, in the aggregate, for all Pension Plans does not exceed $25,000,000; (iii) neither any Borrower nor any ERISA Affiliate has incurred, or reasonably expects to incur, any liability under Title IV of ERISA to the PBGC with respect to any Pension Plan (other than premiums due and not delinquent under Section 4007 of ERISA); and (iv) neither any Borrower nor any ERISA Affiliate has engaged in a transaction that could be subject to Section 4069 or 4212(c) of ERISA.

6.17 Taxes. The Loan Parties and their Restricted Subsidiaries have filed all federal and, except to the extent that a failure to do so could not reasonably be expected to have a Material Adverse Effect, other tax returns and tax reports required to be filed (or appropriate extensions have been timely filed), and have paid all federal and other taxes, assessments, fees and other governmental charges levied or imposed upon them or their properties, income or assets otherwise due and payable, except where such nonpayment would not constitute a breach of Section 7.1(b).

6.18 Regulated Entities. None of any Loan Party, any Person controlling any Loan Party, or any Subsidiary of any Loan Party, is an “Investment Company” within the meaning of the Investment Company Act of 1940. No Loan Party is a regulated entity under the Federal Power Act, the Interstate Commerce Act, any state public utilities code or law, or any other federal or state statute or regulation limiting its ability to incur Debt.

6.19 Use of Proceeds; Margin Regulations. The proceeds of any Borrowing are to be used solely (a) to pay the costs and expenses related to this Agreement, (b) for working capital purposes of the Loan Parties, and (c) for general corporate purposes, including acquisitions permitted under this Agreement. None of such proceeds will be used for the purpose of purchasing or carrying any “margin stock” as defined in Regulations T, U, or X of the Board of Governors of the Federal Reserve System or for any other purpose which might constitute this transaction a “purpose credit” within the meaning of such regulations. No part of the proceeds of any Borrowing will be used for any purpose which violates, or is inconsistent with, the provisions of Regulation X. No Loan Party nor any Subsidiary of such Loan Party is engaged in the business of purchasing or selling Margin Stock or extending credit for the purpose of purchasing or carrying Margin Stock. Following the application of the proceeds of each Borrowing,

not more than 25% of the value of the assets (either of any individual Borrower or of the Loan Parties on a consolidated basis) subject to the provisions of Section 7.9 or Section 7.18 or subject to any restriction contained in any agreement or instrument between any Borrower and any Lender or any Affiliate of any Lender relating to Debt and within the scope of Section 9.1(d) will be Margin Stock.

6.20 Copyrights, Patents, Trademarks and Licenses, etc. Each Loan Party owns or is licensed or otherwise has the right to use all of the Proprietary Rights, contractual franchises, licenses, permits, rights of way, authorizations, and other rights that are reasonably necessary for the operation of its businesses, without conflict with the rights of any other Person. To the best knowledge of any Borrower, no slogan or other advertising device, product, process, method, substance, part, or other material now employed, or now contemplated to be employed, by any Loan Party or any Subsidiary of any Loan Party infringes upon any rights held by any other Person, which in either case, could reasonably be expected to (a) have a Material Adverse Effect, (b) impair any Collateral, or (c) adversely affects the Agent’s enforcement of its rights in any Collateral. No claim or litigation regarding any of the foregoing is pending, or, to the best knowledge of any Loan Party, threatened, and no patent, invention, device, application, principle or any statute, law, rule, regulation, standard or code is pending or, to the knowledge of any Borrower, proposed, which, in either case, could reasonably be expected to have a Material Adverse Effect.

6.21 No Material Adverse Change. No Material Adverse Effect has occurred since the latest date of the Financial Statements delivered to the Lenders.

6.22 Full Disclosure. None of the representations or warranties (other than as to estimates, projections, and pro forma Financial Statements) made by any Loan Party in the Loan Documents as of the date such representations and warranties are made or deemed made, and none of the statements contained in any exhibit, report, statement or certificate furnished by or on behalf of any Loan Party in connection with the Loan Documents (including the offering and disclosure materials delivered by or on behalf of the Loan Parties to the Lenders prior to the Closing Date), contains any untrue statement of a material fact or omits any material fact required to be stated therein or necessary to make the statements made therein, in light of the circumstances under which they are made, not misleading as of the time when made or delivered. Any estimates, projections, and pro forma Financial Statements delivered to the Agent or the Lenders were prepared in good faith based on assumptions believed to be reasonable at the time.

6.23 Locations of Collateral. Schedule 6.23, as updated in writing by the Loan Parties to the Agent from time to time, contains, as of the last date updated pursuant to Section 5.3(j), a correct and complete list of all manufacturing facilities, warehouses, storage facilities, or customer or vendor locations where Collateral is located (other than Collateral in transit).

6.24 Deposit Accounts. Schedule 6.24 contains as of the Closing Date a complete and accurate list of all Deposit Accounts maintained by the Loan Parties with any bank or other financial institution.

6.25 Governmental Authorization. No approval, consent, exemption, authorization, or other action by, or notice to, or filing with, any Governmental Authority or other Person is necessary or required in connection with (a) the execution or delivery by, or enforcement against, any Loan Party of this Agreement or any other Loan Document or (b) the borrowing and repayment of the Loans or the granting and maintenance of Liens in the Collateral, other than (i) those already obtained, (ii) the filing of UCC financing statements, and (iii) the filing of the Copyright Security Agreements and the Patent and Trademark Agreements.

6.26 No Restrictions. There exists no document, contract, or agreement to which any Loan Party or any direct or indirect parent of any Loan Party is a party that could reasonably be expected to materially and adversely affect this Agreement, any other Loan Document, or the transactions contemplated hereby or thereby or that otherwise restricts or prohibits the transactions contemplated hereby or thereby.

ARTICLE 7.

AFFIRMATIVE AND NEGATIVE COVENANTS

Each Borrower (and each other Loan Party by execution of an Obligation Guaranty, with respect to covenants applicable to such Loan Party) covenants to the Agent and each Lender that so long as any of the Obligations remain outstanding or this Agreement is in effect:

7.1 Taxes and Other Obligations. Except to the extent that a failure to do so could not reasonably be expected to have a Material Adverse Effect, each Loan Party shall, and shall cause each of its Subsidiaries to, (a) file prior to delinquency all tax returns and other tax reports which it is required to file; and (b) pay, or provide for the payment, when due, of all taxes, fees, assessments and other governmental charges against it or upon its property, income and franchises, make all required withholding and other tax deposits, and establish adequate reserves or other provision required by GAAP for the payment of all such items, and provide to the Agent and the Lenders, upon request, satisfactory evidence of its timely compliance with the foregoing. Notwithstanding the foregoing, the failure of a Loan Party or any of its Subsidiaries to comply with the foregoing shall not constitute a breach of this Section 7.1 if (i) such amounts are not yet due and payable; or (ii) (A) such Loan Party is contesting such taxes, fees, assessments, or governmental charges in good faith by appropriate proceedings diligently pursued, (B) such Loan Party has established proper reserves as required under GAAP, and (C) the nonpayment of such amounts does not result in the imposition of a Lien (other than a Permitted Lien).

7.2 Legal Existence and Good Standing. Except as permitted by Section 7.9, each Loan Party shall maintain its legal existence and its qualification and good standing in all jurisdictions in which the failure to maintain such existence and qualification or good standing could reasonably be expected to have a Material Adverse Effect. The foregoing shall not restrict any merger, consolidation, wind-up, liquidation or dissolution permitted by Section 7.9.

7.3 Compliance with Law and Agreements; Maintenance of Licenses; Amendments to Charter Documents. Each Loan Party shall comply, and shall cause each of its Subsidiaries to comply, in all material respects, with all Requirements of Law of any Governmental Authority having jurisdiction over it or its business (including the Federal Fair Labor Standards Act and all Environmental Laws), except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. No Loan Party shall violate the provisions of any Material Agreement, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. Each Loan Party shall, and shall cause each of its Subsidiaries to, obtain and maintain all licenses, permits, franchises, and governmental authorizations necessary to own its property and to conduct its business as conducted on the Closing Date, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. No Loan Party shall modify, amend, or alter its certificate or articles of incorporation, or its limited liability company operating agreement or limited partnership agreement, as applicable, other than in a manner which does not adversely affect the rights of the Lenders or the Agent.

7.4 Maintenance of Property; Inspection of Property.

(a) Each Loan Party shall, and shall cause each of its Restricted Subsidiaries to, maintain all of its Collateral and other material property necessary and useful in the conduct of its business, in good operating condition and repair, ordinary wear and tear excepted.

(b) Each Loan Party shall permit representatives and independent contractors of the Agent (at the expense of the Borrowers not to exceed (i) once per year or (ii) twice per year if the Availability is less than or equal to (A) the greater of (x) 40% of the Maximum Revolver Amount and (y) $160,000,000 for five (5) consecutive Business Days during such one year period or (B) the greater of (x) 35% of the Maximum Revolver Amount and (y) $140,000,000 at any time during such one year period, in each case unless a Default or an Event of Default has occurred and is continuing) to visit and inspect any of its properties, to examine its corporate, financial and operating records, and make copies thereof or abstracts therefrom and to discuss its affairs, finances and accounts with its directors, officers and independent public accountants, at such reasonable times during normal business hours and as soon as may be reasonably desired, upon reasonable advance notice to such Loan Parties; provided, however, when a Default or an Event of Default exists, the Agent or any Lender may do any of the foregoing at the expense of the Borrowers at any time during normal business hours without advance notice. The Agent and the Lenders shall give the Borrowers the opportunity to participate in any discussions with the Borrowers’ independent public accountants. Notwithstanding anything to the contrary in this Section 7.4, at all times during such visits and inspections, the Agent or any Lender (or their respective representatives or contractors) must comply with all applicable reasonable site regulations as the Loan Party or its Restricted Subsidiaries or any of their respective officers or employees may require by reasonable notice of the same.

(c) Each Loan Party shall own or have valid licenses for all Proprietary Rights necessary for the anticipated future conduct of the business of each such Loan Party.

7.5 Insurance.

(a) Each Loan Party shall maintain, and shall cause each of its Restricted Subsidiaries to maintain, insurance with insurers (with a Best Rating of at least A7, unless otherwise approved by the Agent) satisfactory to Agent, (it being understood that the companies acceptable to the Agent on the Closing Date shall be acceptable thereafter absent a change in rating or other circumstances), (i) with respect to the properties and business of the Borrowers and the Restricted Subsidiaries of such type (including product liability, workers’ compensation, or commercial crime insurance), in such amounts, and with such coverages and deductibles as are customary for companies similarly situated (it being understood that policies acceptable in form and substance to the Agent in connection with the initial closing shall be generally acceptable thereafter absent a change in law, facts, or circumstances) and (ii) business interruption insurance in an amount not less than $300,000,000, with deductibles and subject to an insurance assignment satisfactory to the Agent (other than with respect to North American Pipe Corporation or Westech Building Products, Inc. for which no business interruption insurance is required absent a change in circumstances).

(b) Notwithstanding the foregoing, each Borrower shall maintain insurance with respect to the Collateral, covering casualty, hazard, public liability, theft, malicious mischief, flood and other risks, in amounts, with endorsements and with insurers (with a Best Rating of at least A7, unless otherwise approved by the Agent) satisfactory to the Agent. From time to time upon request, the Borrowers shall deliver to the Agent ▇▇▇▇▇ certificates of insurance or, upon request, certified copies of its insurance policies. Unless the Agent shall agree otherwise, each policy shall include satisfactory endorsements (i) showing the Agent as a loss payee as to the

Collateral or additional insured, as appropriate; (ii) requiring at least ten (10) days prior written notice to the Agent in the event of cancellation of the policy; and (iii) specifying that the interest of the Agent in the property insured will not be invalidated by: (A) any act or neglect of any Borrower or the owner of the property, (B) foreclosure, notice of sale, or similar proceedings with respect to the property, (C) change in the title or ownership of the property, or (D) change to a more hazardous occupancy. If any Borrower fails to provide and pay for any insurance, the Agent may, at its option, but shall not be required to, procure the insurance and charge the Borrowers therefor. While no Event of Default exists, the Borrowers may settle, adjust or compromise any insurance claim, as long as the proceeds are delivered to the Agent in accordance with Section 7.6. If an Event of Default exists, only the Agent shall be authorized to settle, adjust and compromise such claims.

7.6 Insurance and Condemnation Proceeds. The Borrowers shall promptly notify the Agent of any loss, damage, or destruction to the Collateral, whether or not covered by insurance, other than any loss, damage, or destruction involving an amount or fair market value of less than $5,000,000 in the aggregate for each occurrence (“Minor Insurance Events”). Other than with respect to Minor Insurance Events, the Agent is hereby authorized to collect all insurance and condemnation proceeds in respect of the Collateral directly and, after deducting from such proceeds the reasonable expenses, if any, incurred by the Agent in the collection or handling thereof, the Agent shall apply such proceeds, ratably, to the reduction of the Obligations (but not a reduction of the Maximum Revolver Amount) in the order provided for in Section 3.7. In the case of any loss, damage, or destruction to any assets of the Loan Parties that includes Collateral and other assets of the Loan Parties, the Loan Parties shall deliver to the Agent satisfactory evidence of the amount of the insurance and condemnation proceeds that are attributable to the Collateral; if the Agent is not satisfied with such evidence, the Agent may, at the expense of the Loan Parties, retain an independent third party to perform such valuation.

7.7 Environmental Laws.

(a) Each Loan Party shall, and shall cause each of their Subsidiaries to, conduct its business in compliance with all Environmental Laws applicable to it, including those relating to the generation, handling, use, storage, and disposal of any Hazardous Material, except where the failure to do so could not reasonably be expected to have a Material Adverse Effect. Each Loan Party shall, and shall cause each of its Subsidiaries to, take prompt and appropriate action to respond to any material non-compliance with Environmental Laws and shall report to the Agent any such material non-compliance and any such response.

(b) Without limiting the generality of the foregoing, the Borrowers shall submit to the Agent and the Lenders annually, commencing on the first Anniversary Date, and on each Anniversary Date thereafter, an update of the status of each material environmental noncompliance or material liability issue of a Loan Party with respect to its property that is reasonably expected to result in liability equal to or greater than $25,000,000. The Agent or any Lender may request copies of technical reports prepared by any Loan Party and their communications with any Governmental Authority to determine whether any Loan Party or any of their Subsidiaries is proceeding reasonably to correct, cure, or contest in good faith any alleged non-compliance or environmental liability. The Borrowers shall, at the Agent’s or the Required Lenders’ request and at the Borrowers’ expense, (i) retain an independent environmental engineer acceptable to the Agent to evaluate the site, including tests if appropriate, where the material non-compliance or alleged material non-compliance with Environmental Laws has occurred and prepare and deliver to the Agent a report setting forth the results of such evaluation, a proposed plan for responding to any environmental problems described therein, and an estimate of the costs thereof, and (ii) provide to the Agent and the Lenders a supplemental report of such engineer whenever the scope of the environmental problems, or the response thereto or the estimated costs thereof, shall increase in any material respect.

7.8 Compliance with ERISA. Each Loan Party shall, and shall cause each of its ERISA Affiliates to: (a) maintain each Plan in compliance in all material respects with the applicable provisions of ERISA, the Code, and other federal or state law; (b) cause each Plan which is qualified under Section 401(a) of the Code to maintain such qualification; (c) make all required contributions to any Plan subject to Section 412 of the Code; (d) not engage in a prohibited transaction or violation of the fiduciary responsibility rules with respect to any Plan which could reasonably be expected to result in liability to any Loan Party in excess of $15,000,000 and (e) not engage in a transaction that could be subject to Section 4069 or 4212(c) of ERISA.

7.9 Mergers; Consolidations; or Sales. No Loan Party nor any of their Restricted Subsidiaries shall enter into any transaction of merger or consolidation, other than (a) as permitted by Section 7.25, or (b) mergers among Loan Parties; provided that, in any merger involving a Borrower, a Borrower must be the surviving entity. No Loan Party nor any of their Restricted Subsidiaries shall transfer, sell, assign, lease, or otherwise dispose of all or any part of its property (including, without limitation, the stock or equity of any Restricted Subsidiary of such Loan Party except as expressly permitted by the immediately preceding sentence), or wind up, liquidate, or dissolve, except:

(i) sales of Inventory in the ordinary course of its business;

(ii) sales or other dispositions of Equipment in the ordinary course of business that are damaged, worn-out, obsolete, or no longer used or useable by any Loan Party in its respective business;

(iii) sales, leases, or other transfers or dispositions among Loan Parties;

(iv) the sale, discount, or transfer of delinquent Accounts that are not Eligible Accounts in the ordinary course of business for purposes of collection, so long as no Default or Event of Default exists;

(v) Distributions permitted by Section 7.10;

(vi) dispositions pursuant to mergers and consolidations permitted by Section 7.9(a);

(vii) dispositions in connection with any Restricted Investments permitted by Section 7.10;

(viii) leases, subleases, licenses, sublicenses, or transfers of property not constituting Collateral (except for Proprietary Rights) (including the provision of software under an open source license), in each case to Joint Ventures or JV Subsidiaries or otherwise in the ordinary course of business and which do not materially interfere with the business of the Loan Parties or any Restricted Subsidiary, so long as (A) such leases, subleases, licenses or sublicenses, or transfer do not adversely affect the Agent’s enforcement of its rights in any Collateral, or (B) if the property leased, subleased, licensed, sublicensed, or transferred is Proprietary Rights, such Joint Venture, JV Subsidiary, or other Person grants a royalty free license to the Agent to use the Proprietary Rights in connection with the Agent’s enforcement of its rights in any Collateral;

(ix) subject to Section 7.6, transfers of property as a result of casualty events;

(x) so long as no Default or Event of Default then exists or arises as a result thereof, the wind up, liquidation, or dissolution of any Restricted Subsidiary that is not a Loan Party, unless the assets of the dissolved Loan Party will be transferred to another Loan Party at such dissolution, wind up, or liquidation, if Westlake determines in good faith that such wind up, liquidation or dissolution is in the best interest of Westlake and is not materially disadvantageous to the Lenders;

(xi) the issuance of Capital Stock by any Loan Party, or any Restricted Subsidiary thereof, to any Loan Party, to the extent not otherwise prohibited by the terms of this Agreement;

(xii) dispositions of cash and Cash Equivalents, and dispositions of assets in securities, brokerage and commodity accounts, each in the ordinary course of business in connection with transactions permitted hereunder;

(xiii) dispositions in connection with any sale and leaseback transaction permitted by Section 7.18; and

(xiv) so long as (A) no Default or Event of Default then exists or arises as a result thereof, and (B) any mandatory prepayments required by Section 3.3(a), if any are required, are made, sales of assets not constituting Collateral, other than those in clauses (i) through (xiii), for fair value, provided that the Loan Parties or their Restricted Subsidiaries shall receive not less than 75% of the purchase price in the form of Permitted Consideration. All assets purchased with such proceeds shall be free and clear of all Liens, except the Agent’s Liens or other Permitted Liens.

7.10 Distributions; Capital Change; Restricted Investments. No Loan Party nor any of their Restricted Subsidiaries shall:

(a) directly or indirectly declare or make, or incur any liability to make, any Distribution (other than Distributions payable in Capital Stock (other than Disqualified Stock) of Westlake), except:

(i) Distributions made and/or declared by wholly owned Subsidiaries;

(ii) Distributions made and/or declared by Westlake and non-wholly owned Subsidiaries, if, on a pro forma basis after giving effect to such Distribution: (A) the Availability equals or exceeds the greater of (x) 25% of the Maximum Revolver Amount and (y) $100,000,000; or (B) to the extent the requirement in clause (A) is not met, (I) the Availability equals or exceeds the greater of (x) 17.5% of the Maximum Revolver Amount and (y) $70,000,000 and (II) the Fixed Charge Coverage Ratio is at least 1.0:1.0; and

(iii) without limiting the amount permitted under clause (ii) above, Distributions made and/or declared by Westlake and non-wholly owned Subsidiaries in the aggregate of up to $25,000,000, if, on a pro forma basis after giving effect to such Distribution, either (A) the Availability equals or exceeds the greater of (x) 17.5% of the Maximum Revolver Amount and (y) $70,000,000, or (B) the Fixed Charge Coverage Ratio is at least 1.0:1.0;

provided that for purposes of a Distribution, the Availability shall be calculated based on the most recent Borrowing Base Certificate delivered pursuant to this Agreement prior to such Distribution (provided that the amount of Eligible Cash shall be the amount on deposit on the date of such Distribution and provided further that the Aggregate Revolver Outstandings shall be calculated on the date of such Distribution) and Distributions are permitted hereunder only if no Default or Event of Default then exists and only to the extent that any such Distribution is made and/or declared in accordance with applicable Requirement of Law and constitutes a valid, non voidable transaction.

(b) make any change in its capital structure which could reasonably be expected to have a Material Adverse Effect; or

(i) Restricted Investment made by the Loan Parties, if on a pro forma basis after giving effect to such Restricted Investment, (A) the Availability equals or exceeds the greater of (x) 25% of the Maximum Revolver Amount and (y) $100,000,000; or (B) to the extent the requirement in clause (A) is not met, (I) the Availability equals or exceeds the greater of (x) 17.5% of the Maximum Revolver Amount and (y) $70,000,000 and (II) the Fixed Charge Coverage Ratio is at least 1.0:1.0; and

(ii) without limiting the amount permitted under clause (i) above, Restricted Investment made by the Loan Parties in the aggregate of up to $25,000,000, if on a pro forma basis after giving effect to such Restricted Investment, either (A) the Availability equals or exceeds the greater of (x) 17.5% of the Maximum Revolver Amount and (y) $70,000,000, or (B) the Fixed Charge Coverage Ratio is at least 1.0:1.0;

provided that no Restricted Investment shall be permitted if a Default or Event of Default has occurred and is continuing or would be caused by such Restricted Investment; provided further that if any payment, prepayment, redemption, defeasance, purchase, or deposit in respect of any Debt of the Loan Parties is permitted to be made under Section 7.14(b), and such payment, prepayment, redemption, purchase, or deposit otherwise constitutes a Restricted Investment, such payment, prepayment, redemption, defeasance, purchase, or deposit shall not be prohibited by the terms of this Section 7.10(c).

For purposes of calculating the Availability in connection with the foregoing Section 7.10(c), the Availability shall be calculated based on the most recent Borrowing Base Certificate delivered pursuant to this Agreement prior to such Restricted Investment (provided that the amount of Eligible Cash shall be the amount on deposit on the date of such Restricted Investment and provided further that the Aggregate Revolver Outstandings shall be calculated on the date of such Restricted Investment).

Notwithstanding the foregoing, the preceding provisions shall not prohibit:

(i) the payment of any dividend within sixty (60) days after the date of declaration of the dividend, if at the date of declaration, the dividend payment would have complied with the provisions of this Agreement;

(ii) so long as no Default or Event of Default has occurred and is continuing or would be caused thereby, (A) the repurchase, redemption or other acquisition or retirement for value of any Capital Stock of any Loan Party held by any current or former officer, director or employee of any Loan Party pursuant to any equity subscription agreement, stock option agreement, shareholders’ agreement or similar plan or agreement, or (B) the repurchase of Capital Stock deemed to occur upon the exercise of

stock options to the extent such Capital Stock represent a portion of the exercise price of those stock options; provided that the aggregate price paid for all transactions under the foregoing (A) and (B) may not exceed $1,000,000 in any twelve-month period.

7.11 Transactions Affecting Collateral or Obligations. No Loan Party nor any of their Restricted Subsidiaries shall enter into any transaction which would be reasonably expected to have a Material Adverse Effect.

7.12 Guaranties. No Loan Party nor any of their Restricted Subsidiaries shall make, issue, or become liable on any Guaranty, except (a) Obligation Guaranties in favor of the Agent, (b) Guaranties of Debt permitted by Section 7.13, (c) unsecured Guaranties by Westlake of another Loan Party for goods furnished or services rendered in the ordinary course of business of such Loan Party, (d) a Guaranty by Westlake Olefins Corporation for the account of Suzhou Huasu Plastics Co. Ltd. in an aggregate amount not to exceed $8,500,000, and (e) to the extent constituting a Restricted Investment permitted by Section 7.10.

7.13 Debt. No Loan Party shall incur or maintain any Debt, other than:

(a) the Obligations;

(b) Debt existing on the Closing Date and described on Schedule 7.13;

(c) Capital Leases, mortgage financings or purchase money obligations, in each case, incurred for the purpose of financing all or any part of the purchase price or cost of design, construction, installation or improvement of property, plant or equipment, in each case, not constituting Inventory; provided that (i) Liens securing the same are permitted by clause (p) of the definition of “Permitted Liens,” and (ii) the aggregate principal amount of purchase money obligations of the Loan Parties constituting Debt outstanding does not exceed $150,000,000 at any time;

(d) the Bond Debt;

(e) other unsecured Debt;

(f) Debt evidencing a substantially concurrent (substantially concurrent shall be not more than forty-five (45) days prior to any refunding, renewal, extension, defeasance, or replacement of Debt) refunding, renewal, extension, defeasance, or replacement (“Refinancing”) of the Debt existing on the Closing Date and described on Schedule 7.13 and other Debt permitted hereunder (the “Replaced Debt”); provided that in the case of any such secured debt (i) the principal amount thereof is not increased, except in an amount equal to all accrued interest on such Replaced Debt and the amount of fees, expenses and premiums incurred in connection with such Refinancing, (ii) the Liens, if any, securing such Debt do not attach to any assets in addition to those types of assets, if any, securing the Replaced Debt, (iii) no Person that is not an obligor or guarantor of such Replaced Debt as of such date shall become as of such date, an obligor or guarantor thereof, and (iv) the terms of such refunding, renewal, or extension are not materially less favorable, taken as a whole, to the Borrowers, the Agent, or the Lenders than the Replaced Debt, including, without limitation, the maturity date thereof and any principal amortization thereof;

(g) Debt of any Loan Party owed to any Restricted Subsidiaries, or Debt of any Restricted Subsidiary owed to the owner of its Capital Stock which is a Loan Party;

(h) Debt to finance insurance premiums in an amount not to exceed $10,000,000 at any time outstanding;

(i) Debt arising under Hedge Agreements or the Gas Supply/Purchase Agreement;

(j) Debt among Loan Parties on terms of the kind customarily employed to allocate charges among members of a consolidated group of entities, in each such case, that are fair and reasonable to the Loan Parties and consistent with past practices of the Loan Parties;

(k) Guaranties permitted by Section 7.12;

(l) Debt constituting Limited Recourse Stock Pledges; and

(m) Debt, other than those in clauses (a) through (l) above, secured by Liens on assets not constituting Collateral, in the aggregate principal amount outstanding at any time not to exceed the greater of (i) $600,000,000 and (ii) 30% of Tangible Assets.

7.14 Payment / Prepayment of Debt. The Loan Parties shall not,

(a) except as expressly permitted by clause (b) hereof, voluntarily prepay any principal of, or interest on, any other Debt, including the Bond Debt, except:

(i) the Obligations in accordance with the terms of this Agreement;

(ii) the Debt in connection with the IRBs;

(iii) prepayments of the Debt permitted by Section 7.13(g) or (i);

(iv) so long as no Default or Event of Default has occurred and is continuing after giving effect to such prepayment, prepayment of any Debt with funds constituting unrestricted cash;

(v) refinancings, refundings, renewals, extensions, replacements, or defeasances of other Debt to the extent such refinancing, refunding, renewal, extension, replacement, or defeasance is permitted by Section 7.13, whether subordinate to the Obligations or not; or

(vi) payment from the net cash proceeds of, or in exchange for, an Equity Issuance by Westlake (other than to another Loan Party or Subsidiary thereof); and

(b) shall not, directly or indirectly, pay, prepay, redeem, defease, or purchase, or deposit funds or property for the payment (including, without limitation, a payment in respect of any sinking fund or defeasance of any Bond Debt), prepayment, redemption, defeasance, or purchase of, any Bond Debt except:

(i) regularly scheduled interest and principal payments on Bond Debt made in compliance with the provisions thereof;

(ii) so long as no Default or Event of Default has occurred and is continuing after giving effect to such prepayment, redemption, or defeasance, redemptions, defeasance, or prepayments (whether voluntary or mandatory, and including redemptions of the GO Zone/Ike Zone debt in connection with an “Extraordinary Optional Redemption”) of the Bond Debt with funds constituting restricted or unrestricted cash;

(iii) refinancings, refundings, renewals, extensions, replacements, or defeasances of any Bond Debt to the extent such refinancing, refunding, renewal, extension, replacement, or defeasance is permitted by Section 7.13; and

(iv) payment from the net cash proceeds of, or in exchange for, an Equity Issuance by Westlake (other than to another Loan Party or Subsidiary thereof).

7.15 Transactions with Affiliates. Except as permitted by Section 7.9(a) or 7.12, or as set forth below, no Loan Party shall sell, transfer, distribute, or pay any money or property, including, but not limited to, any fees or expenses of any nature (including, but not limited to, any fees or expenses for management services), to any Affiliate, or lend or advance money or property to any Affiliate, or invest in (by capital contribution or otherwise) or purchase or repurchase any stock or indebtedness (other than the Obligation Guaranties), or any property, of any Affiliate, or become liable on any Guaranty of the indebtedness, dividends, or other obligations of any Affiliate other than (a) transactions between the Loan Parties on terms of the kind customarily employed to allocate charges among members of a consolidated group of entities, in each such case, that are fair and reasonable to the Loan Parties and consistent with past practices of the Loan Parties, and (b) (i) transactions with respect to tax sharing agreements that became effective prior to the date hereof, and (ii) transactions with respect to tax sharing agreements that became effective on or after the date hereof so long as (x) the Loan Parties do not pay more taxes in the aggregate pursuant to such tax sharing agreement described in this clause (ii) than the Loan Parties in the aggregate would be required to pay if each Loan Party filed a separate tax return, or (y) the tax sharing agreement described in this clause (ii) replaces a prior tax sharing agreement and the Loan Parties do not pay more taxes in the aggregate pursuant to the tax sharing agreement than the Loan Parties would have paid in the aggregate under such prior tax sharing agreement. Notwithstanding the foregoing, while no Event of Default has occurred and is continuing and so long as otherwise permitted in this Agreement, the Loan Parties and their Restricted Subsidiaries may engage in transactions with Affiliates in amounts and on terms no less favorable to the Loan Parties and their Restricted Subsidiaries than would be obtained in a comparable arm’s-length transaction with a third party who is not an Affiliate; provided that the foregoing restrictions shall not apply to:

(i) any Distribution and Restricted Investments permitted by Section 7.10;

(ii) any transactions between or among any Loan Parties;

(iii) any transactions with a Person (other than an Unrestricted Subsidiary) that is an Affiliate of a Loan Party solely because such Loan Party owns, directly or indirectly through a Restricted Subsidiary, Capital Stock in, or controls, such Person;

(iv) payment of reasonable directors’ fees to Persons who are not otherwise Affiliates of Westlake; or

(v) any issuance of Equity Interests not otherwise prohibited by this Agreement.

7.16 Business Conducted. No Loan Party will, directly or indirectly, permit or suffer to exist any material change in the type of businesses in which it is engaged from the businesses of the Loan Parties as conducted on the Closing Date and in similar or related businesses that are reasonable extensions or additions to the Loan Parties’ business on the Closing Date.

7.17 Liens. No Loan Party shall create, incur, assume, or permit to exist any Lien on any property now owned or hereafter acquired by any of them, except Permitted Liens.

7.18 Sale and Leaseback Transactions. No Loan Party or any of their Restricted Subsidiaries shall, directly or indirectly, enter into any arrangement with any Person providing for such Loan Party or such Restricted Subsidiary to lease or rent property that such Loan Party or such Restricted Subsidiary has sold or will sell or otherwise transfer to such Person, except for sale and leaseback transactions with respect to which the obligations of the Loan Parties do not exceed $150,000,000, in the aggregate, at any time.

7.19 New Subsidiaries. No Loan Party shall, directly or indirectly, organize, create, acquire, or permit to exist any Subsidiary without giving the Agent at least ten (10) days prior written notice of such organization, creation, or acquisition (or such lesser time as agreed to by the Agent in its sole discretion). The Borrowers shall cause each Person that becomes a Restricted Subsidiary of any Loan Party after the Closing Date (whether as a result of acquisition, merger, creation, or otherwise), (a) to execute an Obligation Guaranty promptly after the date such entity becomes a Restricted Subsidiary of a Loan Party and promptly deliver (but in no event later than ten (10) days following distribution by the Agent or its counsel of such Obligation Guaranty for execution) such Obligation Guaranty to the Agent and (b) to execute and deliver to the Agent all required Collateral Documents (substantially in the form of any comparable Collateral Documents delivered under the Existing Credit Agreement or otherwise acceptable to the Agent and in no event later than ten (10) days following distribution by the Agent or its counsel of such Collateral Documents for execution) creating Agent’s Liens in favor of the Agent in the Collateral owned by such Restricted Subsidiary.

7.20 Fiscal Year. No Loan Party shall change its Fiscal Year.

7.21 Fixed Charge Coverage Ratio. Effective on and during the continuance of the Triggering Date and based on the most recently delivered Financial Statements received pursuant to Section 5.2, the Borrowers will maintain a Fixed Charge Coverage Ratio for each period of immediately preceding twelve (12) months of not less than 1.0 to 1.0.

7.22 Use of Proceeds. No Loan Party shall nor shall a Loan Party suffer or permit any Restricted Subsidiary to, use any portion of the Loan proceeds, directly or indirectly, (a) to purchase or carry Margin Stock, (b) to repay or otherwise refinance indebtedness of the Borrowers or others incurred to purchase or carry Margin Stock, (c) to extend credit for the purpose of purchasing or carrying any Margin Stock, or (d) to acquire any security in any transaction that is subject to Section 13 or 14 of the Exchange Act.

7.23 Collateral. (a) To secure the full and complete payment and performance of the Obligations, the Loan Parties shall (and shall cause each Restricted Subsidiary to) enter into Collateral Documents (substantially in the form of comparable Collateral Documents delivered under the Existing Credit Agreement or otherwise acceptable to the Agent) pursuant to which, among other things, each such entity shall, to the extent permitted by applicable law, grant, pledge, assign, and create first priority Agent’s Liens (except to the extent Permitted Liens affect such priority) in and to all Collateral owned by such entity.

(b) Notwithstanding anything to the contrary in this Agreement or any other Loan Document, obligations of any Loan Party to any Lender or any Affiliate of any Lender (other than the Bank or any Affiliate of the Bank, in which case no notice shall be required) under or in connection with any Hedge Agreement constituting Bank Product shall not constitute Pari Passu Bank Product Obligations except to the extent that such Lender or its Affiliate and the applicable

Loan Party have prior to or promptly following the entering into of the applicable Hedge Agreement, delivered a written notice of the Bank Product Termination Value of the obligations of any Loan Party to such Lender or such Affiliate of such Lender under such Hedge Agreement to be included in Pari Passu Bank Product Obligations, together with a description of the methodology to be used by such parties in determining the Bank Product Termination Value from time to time, and the Agent has acknowledged receipt of such notice in writing, which acknowledgement shall be promptly delivered by the Agent following receipt of such notice. Upon receipt of such notice, the Agent shall establish a Bank Product Reserve in the amount of such Bank Product Termination Value.

(c) The Bank Product Termination Value (other than with respect to the Bank or any Affiliate of the Bank, in which case no notice shall be required) may be changed from time to time upon written notice to the Agent by the applicable Lender or Affiliate thereof. Any such increase in the Bank Product Termination Value shall not constitute a portion of the Pari Passu Bank Product Obligations until the Agent shall have received written notice of such increase as set forth above, and the Agent has acknowledged receipt of such notice in writing, which acknowledgement shall be promptly delivered by the Agent following receipt of such notice. Upon receipt of such notice, the Agent shall adjust the applicable Bank Product Reserve by the amount specified in such notice.

(d) The provisions of this Section 7.23 shall continue to apply to any Hedge Agreement entered into by any Lender or its Affiliates, in the event the Lender ceases to be a Lender pursuant to Section 4.9, 11.1(c), or 11.2 hereof, and each Lender may continue to provide reports of increase of Bank Product Termination Values to the Agent until the Hedge Agreement is terminated or this Agreement is terminated pursuant to Section 10.1 or otherwise, but all other Bank Products of any Lender or its Affiliates shall cease to be a part of the Obligations in the event any Lender ceases to be a Lender hereunder.

(e) No Bank Product Termination Value may be established or increased at any time that a Default or Event of Default exists, or if creating a Reserve against such Bank Product Termination Value or the increase thereof would cause the Obligations to exceed the Borrowing Base, except with respect to obligations of any Loan Party under or in connection with any Bank Products (other than Hedge Agreements) of the Bank or any Affiliate of Bank.

(f) With respect to the obligations of the Loan Parties to the Bank or any Affiliate of the Bank under any Hedge Agreement, the amount determined by the Bank or any Affiliate of the Bank, and reflected on the documentation and records of the Bank or of such Affiliate shall be part of the Pari Passu Bank Product Obligations. No Bank Product Termination Value under or in connection with any Hedge Agreement of the Bank or any Affiliate of the Bank may be established or increased at any time that a Default or Event of Default exists, or if creating a Reserve against such Bank Product Termination Value or the increase thereof would cause the Obligations to exceed the Borrowing Base.

(g) Lenders (other than the Bank or any Affiliate of the Bank, but including Lenders who cease to be Lenders hereunder as described in paragraph (d) above) agree to report Bank Product Termination Value to Agent as requested by Agent from time to time.

(h) The Agent may, but shall not be required to, from time to time, at any time, establish Reserves with respect to Bank Products (other than Hedge Agreements) provided by (i) the Bank or an Affiliate of the Bank, or (ii) any other Lender or any Affiliate of any Lender provided that such Lender or Affiliate shall provide notice of such Bank Product to the Agent in accordance with the procedures set forth in this Section 7.23 with respect to Hedge Agreements, and the Agent has received and acknowledged such notice.

7.24 Tax Shelter Regulations.

(a) The Borrowers do not intend to treat the Revolving Loans and/or Letters of Credit and related transactions as being a “reportable transaction” (within the meaning of Treasury Regulation Section 1.6011-4). In the event the Borrowers determine to take any action inconsistent with such intention, it will promptly notify the Agent thereof. If the Borrowers so notify the Agent, the Borrowers acknowledge that one or more of the Lenders may treat its Loans and/or its interest in Non-Ratable Loans and/or Agent Advances and/or Letters of Credit as part of a transaction that is subject to Treasury Regulation Section 301.6112-1, and such Lender or Lenders, as applicable, will maintain the lists and other records required by such Treasury Regulation.

(b) Neither the Agent nor any Lender intends to treat the Revolving Loans and/or Letters of Credit and related transactions as being a “reportable transaction” (within the meaning of Treasury Regulation Section 1.6011-4). In the event the Agent or any Lender determines to take any action inconsistent with this intention, such person will so notify Westlake. If the Agent or any Lender so notifies Westlake, the Agent and such Lender acknowledge that one or more of the Borrowers may treat any Loans and/or Letter of Credit as part of a transaction that is subject to Treasury Regulation Section 301.6112-1, and such Borrower or Borrowers, as applicable, will maintain the lists and other records required by such Treasury Regulation.

7.25 Permitted Acquisitions. The Loan Parties may consummate Acquisitions, so long as:

(a) the Acquisition by a Loan Party is of a Person or assets which are in substantially the same lines of business as the business conducted by such Loan Party on the date hereof, or any other business reasonably related thereto;

(b) as of the closing thereof, each Acquisition has been approved and recommended by the board of directors (or equivalent body) of the Person to be acquired or from which such business or asset is to be acquired;

(c) prior to the closing of such Acquisition (other than an Acquisition of assets), the Person to be acquired is Solvent;

(d) as of the closing of the Acquisition, after giving effect thereto, the Loan Party that is the acquiring party must be Solvent and the Loan Parties, on a consolidated basis, must be Solvent;

(e) if such Acquisition is structured as a merger by a Loan Party, a Loan Party must be the surviving entity after giving effect to such merger;

(f) if such Acquisition is structured as a merger by a Borrower, a Borrower must be the surviving entity after giving effect to such merger;

(g) as of the closing of any Acquisition, no Default or Event of Default shall exist or occur as a result thereof, and after giving effect thereto;

(h) if the Acquisition target is to be a Restricted Subsidiary, then the Borrowers shall have complied with the terms and conditions of Section 7.19;

(i) the absence of action, suit, investigation, or proceeding pending or threatened in a any court or before any arbitrator or Governmental Authority that affects the target or the proposed Acquisition, which could reasonably be expected to have a Material Adverse Effect on the target or the Loan Parties;

(j) immediately after giving effect to the Acquisitions, (A) the Availability equals or exceeds the greater of (x) 25% of the Maximum Revolver Amount and (y) $100,000,000; or (B) to the extent the requirement in clause (A) is not met, (I) the Availability equals or exceeds the greater of (x) 17.5% of the Maximum Revolver Amount and (y) $70,000,000 and (II) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; provided that to the extent neither of the foregoing requirements in this clause (j) is met, the Loan Parties may nevertheless consummate Acquisitions in the aggregate of up to $25,000,000 if immediately after giving effect to the Acquisitions, either (A) the Availability equals or exceeds the greater of (x) 17.5% of the Maximum Revolver Amount and (y) $70,000,000 but is less than the greater of (x) 25% of the Maximum Revolver Amount and (y) $100,000,000, or (B) the Pro Forma Fixed Charge Coverage Ratio is at least 1.0:1.0; and

(k) for the purposes of calculating the Availability under this Section 7.25, no assets of the Person to be acquired or the assets to be acquired shall be included in the Borrowing Base unless such assets are acceptable to the Agent.

For purposes of calculating the Availability in connection with the foregoing clauses (j) and (k), the Availability shall be calculated based on the most recent Borrowing Base Certificate delivered pursuant to this Agreement prior to such Acquisition (provided that the amount of Eligible Cash shall be the amount on deposit on the date of such Acquisition and provided further that the Aggregate Revolver Outstandings shall be calculated on the date of such Acquisition).

For purposes of Sections 7.25 and 7.10(c) only, notwithstanding anything in Sections 7.25 or 7.10(c) to the contrary, (i) a series of investments not to exceed $200,000,000 in one or more Joint Ventures which will own feedstock, raw material and ethylene pipeline, storage and fractionating facilities, and (ii) investments in Suzhou Huasu Plastics Co., Ltd. made on or prior to the date hereof, plus additional investments therein not to exceed $55,000,000, shall each be permitted hereunder, and no assets at any time owned by such Joint Venture or Suzhou Huasu Plastics Co., Ltd. shall be included in the Borrowing Base.

7.26 Excluded Deposit Accounts. In the event the amount of funds on deposit in the Local Accounts ever exceeds $300,000 at any time in the aggregate on any date of determination, the Borrowers shall immediately deliver to the Agent Blocked Account Agreements with respect to each such Local Account.

7.27 Further Assurances. The Loan Parties shall execute and deliver, or cause to be executed and delivered, to the Agent and/or any Lender such documents and agreements, and shall take or cause to be taken such actions, as the Agent may, from time to time, reasonably request to carry out the terms and conditions of this Agreement and the other Loan Documents.

ARTICLE 8.

CONDITIONS OF LENDING

8.1 Conditions Precedent to Making of Loans on the Closing Date. The obligation of the Lenders to make the Revolving Loans on the Closing Date, and the obligation of the applicable Letter of Credit Issuer to issue any Letter of Credit on the Closing Date, are subject to the following conditions precedent having been satisfied in a manner satisfactory to the Agent and each Lender:

(a) This Agreement and the other Loan Documents shall have been executed by each party thereto and each Loan Party, as applicable, shall have performed and complied with all covenants, agreements, and conditions contained herein and the other Loan Documents which are required to be performed or complied with by the Loan Parties before or on such Closing Date.

(b) Upon making the Revolving Loans on the Closing Date (including such Revolving Loans made to finance the Closing Fee or otherwise as reimbursement for fees, costs, and expenses then payable under this Agreement), and with all its obligations current, the Borrowers shall have Availability of at least $150,000,000.

(c) All representations and warranties made hereunder and in the other Loan Documents shall be true and correct as if made on such date.

(d) No Default or Event of Default shall have occurred and be continuing after giving effect to the Revolving Loans to be made and the Letters of Credit to be issued on the Closing Date.

(e) The Agent and the Lenders shall have received such opinions of counsel for the Loan Parties as the Agent or any Lender shall request, each such opinion to be in a form, scope, and substance reasonably satisfactory to the Agent, the Lenders, and their respective counsel.

(f) The Agent shall have received financing statements or amendments in proper form for filing, under the UCC in all jurisdictions that the Agent may deem necessary or desirable in order to perfect the Agent’s Liens.

(g) The Borrowers shall have paid all fees, including the amounts owing as of the Closing Date under the Fee Letter, and expenses of the Agent and the Attorney Costs incurred in connection with any of the Loan Documents and the transactions contemplated thereby to the extent invoiced.

(h) The Agent shall have received evidence, in form, scope, and substance, reasonably satisfactory to the Agent, of all insurance coverage as required by this Agreement.

(i) The Agent and the Lenders shall have had an opportunity, if they so choose, to examine the books of account and other records and files of the Loan Parties and to make copies thereof, and to conduct a pre-closing audit which shall include, without limitation, verification of Inventory, Accounts, and the Borrowing Base, and the results of such examination and audit shall have been satisfactory to the Agent and the Lenders in all respects.

(j) All proceedings taken in connection with the execution of this Agreement, the Notes, all other Loan Documents, and all documents and papers relating thereto shall be satisfactory in form, scope, and substance to the Agent and the Lenders.

(k) Each Loan Party shall have established all of its Deposit Accounts at the Bank or shall have entered into Blocked Account Agreements (on terms acceptable to the Agent) with respect to all Deposit Accounts not established at the Bank other than immaterial local accounts of the Loan Parties (the “Local Accounts”) so long as the amount of funds on deposit in such accounts does not exceed $300,000 in the aggregate at any time.

(l) Since December 31, 2010, no event has occurred and is continuing, or would result from such extension of credit, which has had or would (after giving effect thereto) reasonably be expected to have a Material Adverse Effect.

(m) After giving effect to the incurrence of the Bond Debt and the incurrence of Debt under this Agreement, the Agent shall be reasonably satisfied with the corporate and capital structure and management of Westlake and its Subsidiaries.

(n) The Agent shall have received, each in form and substance satisfactory to Agent the Financial Statements.

(o) Evidence satisfactory to the Lenders that no approval, consent, exemption, authorization, or other action by, or notice to, or filing with, any Governmental Authority or other Person is necessary or required in connection with the execution, delivery or performance by, or enforcement against, any Loan Party of this Agreement or any other Loan Document other than (i) those already obtained, (ii) the filing of UCC financing statements, and (iii) the filing of the Copyright Security Agreements and the Patent and Trademark Agreements.

(p) The Lenders are satisfied with the environmental matters concerning the Loan Parties.

(q) Without limiting the generality of the items described above, each Loan Party shall have delivered or caused to be delivered to the Agent (in form and substance reasonably satisfactory to the Agent), the financial statements, instruments, resolutions, documents, agreements, certificates, opinions, and other items set forth on the “Closing Checklist” delivered by the Agent to Westlake prior to the Closing Date.

The acceptance by the Borrowers of any Loans made or Letters of Credit issued on the Closing Date shall be deemed to be a representation and warranty made by the Borrowers to the effect that all of the conditions precedent to the making of such Loans or the issuance of such Letters of Credit have been satisfied or waived, with the same effect as delivery to the Agent and the Lenders of a certificate signed by a Responsible Officer on behalf of the Borrowers, dated the Closing Date, to such effect.

Execution and delivery to the Agent by a Lender of a counterpart of this Agreement shall be deemed confirmation by such Lender that (i) all conditions precedent in this Section 8.1 have been fulfilled to the satisfaction of such Lender, (ii) the decision of such Lender to execute and deliver to the Agent an executed counterpart of this Agreement was made by such Lender independently and without reliance on the Agent or any other Lender as to the satisfaction of any condition precedent set forth in this Section 8.1, and (iii) all documents sent to such Lender for approval consent, or satisfaction were acceptable to such Lender, unless the Agent shall have received notice from such Lender prior to the proposed Closing Date specifying its objection with respect to the foregoing clause (i), (ii), or (iii).

8.2 Conditions Precedent to Each Loan. The obligation of the Lenders to make each Loan, including the initial Revolving Loans on the Closing Date, and the obligation of the applicable Letter of Credit Issuer to issue any Letter of Credit shall be subject to the further conditions precedent that on and as of the date of any such extension of credit:

(a) The following statements shall be true, and the acceptance by the Borrowers of any extension of credit shall be deemed to be a statement to the effect set forth in clauses (i), (ii), and (iii) with the same effect as the delivery to the Agent and the Lenders of a certificate signed by a Responsible Officer on behalf of the Loan Parties, dated the date of such extension of credit, stating that:

(i) The representations and warranties contained in this Agreement and the other Loan Documents are correct in all material respects on and as of the date of such extension of credit as though made on and as of such date, other than any such representation or warranty which relates to a specified prior date and except to the extent the Agent and the Lenders have been notified in writing by the Borrowers that any representation or warranty is not correct and the Required Lenders have explicitly waived in writing compliance with such representation or warranty;

(ii) No event has occurred and is continuing, or would result from such extension of credit, which constitutes a Default or an Event of Default; and

(iii) No event has occurred and is continuing, or would result from such extension of credit, which has had or would have a Material Adverse Effect since the latest date of the Financial Statements delivered to the Lenders pursuant to Section 5.2(a).

(b) No such Borrowing shall exceed Availability, provided, however, that the foregoing conditions precedent set forth in this Section 8.2 are not conditions to each Lender participating in or reimbursing the Bank or the Agent for such Lenders’ Pro Rata Share of any Non-Ratable Loan or Agent Advance made in accordance with the provisions of Sections 1.2(h) and (i).

ARTICLE 9.

DEFAULT; REMEDIES

9.1 Events of Default. It shall constitute an event of default (“Event of Default”) if any one or more of the following shall occur for any reason:

(a) any failure or refusal by any Loan Party to pay (i) any principal of the Obligations (other than Bank Products) when the same becomes due (whether by its terms, by acceleration, or as otherwise provided in the Loan Documents); or (ii) interest, fees, premium, or any other part of the Obligations (other than Bank Products) within one day after the same becomes due and payable in accordance with the Loan Documents, whether upon demand or otherwise;

(b) any representation or warranty made or deemed made by any Loan Party in this Agreement or in any of the other Loan Documents, any Financial Statement, or any certificate furnished by any Loan Party at any time to the Agent or any Lender shall prove to be untrue in any material respect as of the date on which made, deemed made, or furnished;

(c) (i) any default shall occur in the observance or performance of any of the covenants and agreements contained in Sections 5.2(j), 7.2 (as to existence only), 7.5, 7.9 through

7.27, or Section 11 of the Security Agreement, (ii) any default shall occur in the observance or performance of any of the covenants and agreements contained in Sections 5.3 or 7.4 and such default shall continue for five (5) days or more, provided that there are not more than, in the aggregate, three (3) occurrences of any such default in any twelve (12) month period; or (iii) any default shall occur in the observance or performance of any of the other covenants or agreements (not specified in Sections 9.1(a), (b), (c)(i), or (c)(ii)) contained in any other Section of this Agreement or any other Loan Document and such default shall continue for thirty (30) days or more or (iv) any default shall occur under Section 5.2 (other than clause (j) thereof) and such default shall continue for 5 Business Days or more;

(d) any “default” or “event of default” shall occur with respect to any Debt (other than the Obligations) of any Loan Party in an outstanding principal amount which exceeds $20,000,000 (in the aggregate), or under any agreement or instrument under or pursuant to which any such Debt may have been issued, created, assumed, or guaranteed by any Loan Party, and such default shall continue for more than the period of grace, if any, therein specified, if the effect thereof (with or without the giving of notice or further lapse of time or both) is to accelerate, or to permit the holders of any such Debt to accelerate, the maturity of any such Debt; or any such Debt shall be declared due and payable or be required to be prepaid prior to the stated maturity or redemption date thereof; provided that this clause (d) shall not apply to secured Debt that becomes due as a result of the voluntary sale or transfer of the property or assets securing such Debt, if such sale or transfer is permitted hereunder and under the documents providing for such Debt;

(e) (i) any Loan Party that is a Borrower or a Material Subsidiary shall (A) file a voluntary petition in bankruptcy or file a voluntary petition or an answer or otherwise commence any action or proceeding seeking reorganization, arrangement, or readjustment of its debts or for any other relief under the federal Bankruptcy Code, as amended, or under any other bankruptcy or insolvency act or law, state or federal, now or hereafter existing, or consent to, approve of, or acquiesce in, any such petition, action, or proceeding; (B) apply for or acquiesce in the appointment of a receiver, assignee, liquidator, sequestrator, custodian, monitor, trustee or similar officer for it or for all or any part of its property; (C) make an assignment for the benefit of creditors; (D) be unable generally to pay its debts as they become due; or (E) not be Solvent; or (ii) the Loan Parties, on a consolidated basis, shall not be Solvent;

(f) an involuntary petition shall be filed or an action or proceeding otherwise commenced seeking reorganization, arrangement, consolidation or readjustment of the debts of any Loan Party that is a Borrower or a Material Subsidiary or for any other relief under the federal Bankruptcy Code, as amended, or under any other bankruptcy or insolvency act or law, state or federal, now or hereafter existing and such petition or proceeding shall not be dismissed within sixty (60) days after the filing or commencement thereof or an order of relief shall be entered with respect thereto;

(g) a receiver, assignee, liquidator, sequestrator, custodian, monitor, trustee or similar officer for any Loan Party that is a Borrower or a Material Subsidiary or for all or any part of their respective property shall be appointed or a warrant of attachment, execution, or similar process shall be issued against any part of the property of Westlake or any of its Restricted Subsidiaries;

(h) any Loan Party shall file a certificate of dissolution under applicable state law or shall be liquidated, dissolved or wound-up or shall commence or have commenced against it any action or proceeding for dissolution, winding-up or liquidation, or shall take any corporate action in furtherance thereof except as permitted under Sections 7.2 or 7.9;

(i) all or any material part of the property of any Loan Party shall be nationalized, expropriated, or condemned, seized, or otherwise appropriated, or custody or control of such property or of such Loan Party shall be assumed by any Governmental Authority or any court of competent jurisdiction at the instance of any Governmental Authority, except where contested in good faith by proper proceedings diligently pursued where a stay of enforcement is in effect;

(j) any Loan Document shall be terminated, revoked, or declared void, invalid, or unenforceable or challenged by any Loan Party or any other obligor;

(k) one or more judgments, orders, decrees, or arbitration awards is entered against the Loan Parties involving in the aggregate liability (to the extent not covered by independent third-party insurance as to which the insurer does not dispute coverage) as to any single or related or unrelated series of transactions, incidents or conditions, of $20,000,000 or more, and either (i) enforcement proceedings are commenced upon such judgment, order, decree, or award, or (ii) there is a period of 30 consecutive days during which a stay of enforcement of such judgment, order, decree, or award, by reason of pending appeal or otherwise, is not in effect;

(l) any loss, theft, damage, or destruction of any item or items of Collateral or other property of any Loan Party occurs which could reasonably be expected to cause a Material Adverse Effect and is not adequately covered by insurance;

(m) there is filed against any Loan Party any action, suit, or proceeding under any federal or state racketeering statute (including the Racketeer Influenced and Corrupt Organization Act of 1970), which action, suit, or proceeding (i) is not dismissed within one hundred twenty (120) days, and (ii) could reasonably be expected to result in the confiscation or forfeiture of any material portion of the Collateral;

(n) for any reason other than the failure of the Agent to take any action available to it to maintain perfection of the Agent’s Liens, pursuant to the Loan Documents, any Loan Document ceases to be in full force and effect or any Lien with respect to any material portion of the Collateral intended to be secured thereby ceases to be, or is not, valid, perfected, and prior to all other Liens (other than Permitted Liens) or is terminated, revoked, or declared void;

(o) (i) an ERISA Event shall occur with respect to a Pension Plan or Multi-Employer Plan which has resulted or could reasonably be expected to result in liability of any Loan Party under Title IV of ERISA to the PBGC in an aggregate amount in excess of $15,000,000; or (ii) any Loan Party or any ERISA Affiliate shall fail to pay when due, after the expiration of any applicable grace period, any installment payment with respect to its withdrawal liability under Section 4201 of ERISA under a Multi-employer Plan in an aggregate amount in excess of $15,000,000;

(p) there occurs a Change of Control;

(q) other than those existing on the Closing Date and disclosed on Schedule 6.13, any Environmental Liabilities in excess of $20,000,000 (to the extent not covered by independent third-party insurance as to which the insurer does not dispute coverage), but excluding: (i) Environmental Liabilities in an aggregate amount at any time up to $35,000,000 for which a Reserve is established for 100% of such aggregate amount; and (ii) amounts in excess of $35,000,000 secured by a perfected first lien on cash collateral equal to 100% of that portion of such amount in excess of the Reserves described in clause (i); or

(r) Except to the extent such Debt is prepaid or redeemed in compliance with Section 7.14, an event shall occur, including, without limitation, a “change in control” or “change of control” as defined in any documents or agreements evidencing or creating the Bond Debt and (i) the trustee or the required holders of any such Debt shall initiate notice under provisions governing such Debt to require (or any Loan Party shall automatically be so required) to redeem or repurchase such Debt, or (ii) any Loan Party shall initiate notice to holders of the Bond Debt in connection with a redemption of such Debt.

9.2 Remedies.

(a) If a Default or an Event of Default exists, the Agent may, in its discretion, and shall, at the direction of the Required Lenders, do one or more of the following at any time or times and in any order, without notice to or demand on the Borrowers: (i) restrict the amount of or refuse to make Revolving Loans; (ii) restrict or refuse to provide Letters of Credit or Credit Support; and (iii) provide written notice to the trustee under the IRB that a default has occurred and requesting acceleration of the maturity of the IRBs. If an Event of Default exists, the Agent, may, in its discretion, and shall, at the direction of the Required Lenders, reduce the Maximum Revolver Amount, or the advance rates against Eligible Accounts and/or Eligible Inventory used in computing the Borrowing Base, or reduce one or more of the other elements used in computing the Borrowing Base. In addition, if an Event of Default exists, the Agent shall, at the direction of the Required Lenders, do one or more of the following, in addition to the actions described in the preceding sentence, at any time or times and in any order, without notice to or demand on the Borrowers: (A) terminate the Commitments and this Agreement; (B) declare any or all Obligations (other than Obligations with respect to Bank Products) to be immediately due and payable; provided, however, that upon the occurrence of any Event of Default described in Sections 9.1(e), 9.1(f), 9.1(g), or 9.1(h), the Commitments shall automatically and immediately expire and all Obligations shall automatically become immediately due and payable without notice or demand of any kind; (C) require the Borrowers to cash collateralize all outstanding Letter of Credit Obligations; and (D) pursue its other rights and remedies under the Loan Documents and applicable law.

(b) If an Event of Default has occurred and is continuing: (i) the Agent shall have for the benefit of the Lenders, in addition to all other rights of the Agent and the Lenders, the rights and remedies of a secured party under the Loan Documents and the UCC; (ii) the Agent may, at any time, take possession of the Collateral and keep it on any Loan Party’s premises, at no cost to the Agent or any Lender, or remove any part of it to such other place or places as the Agent may desire, or the Loan Parties shall, upon the Agent’s demand, at the Borrowers’ cost, assemble the Collateral and make it available to the Agent at a place reasonably convenient to the Agent; and (iii) the Agent may sell and deliver any Collateral at public or private sales, for cash, upon credit or otherwise, at such prices and upon such terms as the Agent deems advisable, in its sole discretion, and may, if the Agent deems it reasonable, postpone or adjourn any sale of the Collateral by an announcement at the time and place of sale or of such postponed or adjourned sale without giving a new notice of sale. Without in any way requiring notice to be given in the following manner, the Loan Parties agree that any notice by the Agent of sale, disposition, or other intended action hereunder or in connection herewith, whether required by the UCC or otherwise, shall constitute reasonable notice to such Loan Party if such notice is mailed by registered or certified mail, return receipt requested, postage prepaid, or is delivered personally against receipt, at least five (5) Business Days prior to such action to Westlake’s address specified

in or pursuant to Section 13.8. If any Collateral is sold on terms other than payment in full at the time of sale, no credit shall be given against the Obligations until the Agent or the Lenders receive payment, and if the buyer defaults in payment, the Agent may resell the Collateral without further notice to any Loan Party. In the event the Agent seeks to take possession of all or any portion of the Collateral by judicial process, the Loan Parties irrevocably waive to the extent permitted under applicable Law: (A) the posting of any bond, surety, or security with respect thereto which might otherwise be required; (B) any demand for possession prior to the commencement of any suit or action to recover the Collateral; and (C) any requirement that the Agent retain possession and not dispose of any Collateral until after trial or final judgment. The Loan Parties agree that the Agent has no obligation to preserve rights to the Collateral or marshal any Collateral for the benefit of any Person. The Agent is hereby granted a license or other right to use, without charge, the Loan Parties’ labels, patents, copyrights, name, trade secrets, trade names, trademarks, and advertising matter, or any similar property, in advertising or selling any Collateral, and unless the terms and provisions of such rights provide otherwise, in completing production of any Collateral, and the Loan Parties’ rights under all licenses and all franchise agreements shall inure to the Agent’s benefit for such purpose. The proceeds of sale shall be applied first to all expenses of sale, including attorneys’ fees, and then to the Obligations. The Agent will return any excess to the Borrowers and the Borrowers shall remain liable for any deficiency.

(c) If an Event of Default occurs and is continuing, the Loan Parties hereby waive, to the extent permitted by applicable law, all rights to notice and hearing prior to the exercise by the Agent of the Agent’s rights to repossess the Collateral without judicial process or to reply, attach or levy upon the Collateral without notice or hearing.

ARTICLE 10.

TERM AND TERMINATION

10.1 Term and Termination. The term of this Agreement shall end on the Stated Termination Date unless sooner terminated in accordance with the terms hereof. The Agent upon direction from the Required Lenders may terminate this Agreement without notice upon the occurrence of an Event of Default. Upon the effective date of termination of this Agreement for any reason whatsoever, all Obligations (including all unpaid principal and accrued but unpaid interest, but excluding Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination) shall become immediately due and payable, and the Borrowers shall immediately make Full Payment of all such Obligations. Notwithstanding the termination of this Agreement, until the Agent has received Full Payment of all Obligations (including all unpaid principal and accrued but unpaid interest, but excluding Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination), the Borrowers shall remain bound by the terms of this Agreement and shall not be relieved of any of their Obligations hereunder or under any other Loan Document, and the Agent and the Lenders shall retain all their rights and remedies hereunder (including the Agent’s Liens in and all rights and remedies with respect to all then existing and after-arising Collateral).

ARTICLE 11.

AMENDMENTS; WAIVERS; PARTICIPATIONS; ASSIGNMENTS; SUCCESSORS

11.1 Amendments and Waivers.

(a) No amendment or waiver of any provision of this Agreement or any other Loan Document, and no consent with respect to any departure by the Loan Parties therefrom, shall be effective unless the same shall be in writing and signed by the Required Lenders (or by the Agent at the written request of the Required Lenders) and the Borrowers and then any such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given; provided, however, that no such waiver, amendment, or consent shall, unless in writing and signed by each Lender (including consent of a Defaulting Lender with respect to clauses (i), (ii), and (iii) below) affected thereby and the Borrowers and acknowledged by the Agent, do any of the following:

(i) increase or extend the Commitment of any Lender;

(ii) postpone or delay any date fixed by this Agreement or any other Loan Document for any payment of principal, interest, fees (other than fees payable solely to the Agent), or other amounts due to the Lenders (or any of them) hereunder or under any other Loan Document;

(iii) reduce the principal of, or the rate of interest specified herein on any Loan, or any fees or other amounts payable hereunder or under any other Loan Document;

(iv) change the percentage of the Commitments or of the aggregate unpaid principal amount of the Revolving Loans which is required for the Lenders or any of them to take any action hereunder;

(v) increase any of the percentages set forth in the definition of the Borrowing Base;

(vi) amend this Section or any provision of this Agreement providing for consent or other action by all Lenders; provided that consent of each Defaulting Lender shall be required to amend clause (i), (ii), or (iii) above;

(vii) release all or substantially all of the Obligation Guaranties or release the Collateral other than as permitted by Section 12.10;

(viii) change the definitions of “Majority Lenders” or “Required Lenders”;

(ix) change the order of application of payments provisions in Section 3.7; or

(x) increase the Maximum Revolver Amount, the Maximum Inventory Loan Amount, or Letter of Credit Subfacility;

provided, however, the Agent may, in its sole discretion and notwithstanding the limitations contained in clauses (v) and (ix) above (other than the limitations restricting the increase in the Maximum Revolver Amount) and any other terms of this Agreement, make Agent Advances in accordance with Section 1.2(i) and, provided further, that (A) no amendment, waiver, or consent shall, unless in writing and signed by

the Agent, affect the rights or duties of the Agent under this Agreement or any other Loan Document; (B) no amendment, waiver, or consent shall, unless in writing and signed by the Letter of Credit Issuers, affect the rights or duties of the Letter of Credit Issuers under this Agreement or any other Loan Document; (C) no amendment shall increase the Commitment of any Lender unless consented to by such Lender (including a Defaulting Lender); and (D) Schedule 1.2 hereto (Commitments) may be amended from time to time by the Agent alone to reflect assignments of Commitments in accordance herewith.

(b) If any fees are paid to the Lenders as consideration for amendments, waivers, or consents with respect to this Agreement, at the Agent’s election, such fees may be paid only to those Lenders that agree to such amendments, waivers or consents within the time specified for submission thereof.

(i) requiring the consent of all Lenders, the consent of Required Lenders is obtained, but the consent of other Lenders is not obtained (any such Lender whose consent is not obtained as described in this clause (i) and in clause (ii) below being referred to as a “Non-Consenting Lender”), or

(ii) requiring the consent of Required Lenders, the consent of Majority Lenders is obtained,

then, so long as the Agent is not a Non-Consenting Lender, at the Borrowers’ request, the Agent or an Eligible Assignee shall have the right (but not the obligation) with the Agent’s approval, to purchase from the Non-Consenting Lenders, and the Non-Consenting Lenders agree that they shall sell, all the Non-Consenting Lenders’ Commitments for an amount equal to the principal balances thereof and all accrued interest and fees with respect thereto through the date of sale pursuant to Assignment and Acceptance, without premium or discount. The Agent is irrevocably appointed as attorney-in-fact to execute any such Assignment and Acceptance if such Lender fails to execute same within twenty (20) days of such request of assignment. Such Lender shall be entitled to receive, in cash, concurrently with such assignment, all amounts owed to it under the Loan Documents, including all principal, interest and fees through the date of assignment (but excluding any prepayment charge).

11.2 Assignments; Participations.

(a) Any Lender may, with the written consent of the Agent and Westlake, which consent shall not be unreasonably withheld, assign and delegate to one or more Eligible Assignees (provided that (i) no consent of the Agent or Westlake shall be required in connection with any assignment and delegation by a Lender to an Affiliate of such Lender, another Lender or an Approved Fund and (ii) no consent of Westlake shall be required if an Event of Default has occurred and is continuing at the time of such assignment) (each an “Assignee”) all, or any ratable part of all, of the Revolving Loans, the Commitment, and the other rights and obligations of such Lender hereunder, in a minimum amount of $10,000,000, or, if less, all of such Lender’s Commitment (provided that, unless an assignor Lender has assigned and delegated all of its Loans and Commitment, no such assignment and/or delegation shall be permitted unless, after giving effect thereto, such assignor Lender retains a Commitment in a minimum amount of $10,000,000); provided, however, that the Borrowers and the Agent may continue to deal solely and directly with such Lender in connection with the interest so assigned to an Assignee until (i) written notice of such assignment, together with payment instructions, addresses and related information with respect to the Assignee, shall have been given to the Borrowers and the Agent

by such Lender and the Assignee; (ii) such Lender and its Assignee shall have delivered to the Borrowers and the Agent an Assignment and Acceptance in the form of Exhibit F (“Assignment and Acceptance”) together with any note or notes, if any, subject to such assignment, and (iii) the assignor Lender or Assignee has paid to the Agent a processing fee in the amount of $3,500. The Borrowers agree to promptly execute and deliver new promissory notes and replacement promissory notes if requested by an Assignee or assignor Lender to evidence assignments of the Revolving Loans and Commitments in accordance herewith.

(b) From and after the date that the Agent notifies the assignor Lender that it has received an executed Assignment and Acceptance (and consent of the Agent thereto, if required) and payment of the above-referenced processing fee, (i) the Assignee thereunder shall be a party hereto and, to the extent that rights and obligations, including, but not limited to, the obligation to participate in Letters of Credit and Credit Support have been assigned to it pursuant to such Assignment and Acceptance, shall have the rights and obligations of a Lender under the Loan Documents (except for such rights and obligations not available to such assignee by express terms of this Agreement), and (ii) the assignor Lender shall, to the extent that rights and obligations hereunder and under the other Loan Documents have been assigned by it pursuant to such Assignment and Acceptance, relinquish its rights and be released from its obligations under this Agreement (and in the case of an Assignment and Acceptance covering all or the remaining portion of an assigning Lender’s rights and obligations under this Agreement, such Lender shall cease to be a party hereto).

(c) By executing and delivering an Assignment and Acceptance, the assigning Lender thereunder and the Assignee thereunder confirm to and agree with each other and the other parties hereto as follows: (i) other than as provided in such Assignment and Acceptance, such assigning Lender makes no representation or warranty and assumes no responsibility with respect to any statements, warranties, or representations made in or in connection with this Agreement or the execution, legality, validity, enforceability, genuineness, sufficiency, or value of this Agreement or any other Loan Document furnished pursuant hereto or the attachment, perfection, or priority of any Lien granted by any Loan Party to the Agent or any Lender in the Collateral; (ii) such assigning Lender makes no representation or warranty and assumes no responsibility with respect to the financial condition of any Loan Party or the performance or observance by any Loan Party of any of its obligations under this Agreement or any other Loan Document furnished pursuant hereto; (iii) such Assignee confirms that it has received a copy of this Agreement, together with such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into such Assignment and Acceptance; (iv) such Assignee will, independently (without reliance upon the Agent, such assigning Lender, or any other Lender, and based on such documents and information as it shall deem appropriate at the time), continue to make its own credit decisions in taking or not taking action under this Agreement; (v) such Assignee appoints and authorizes the Agent to take such action as agent on its behalf and to exercise such powers under this Agreement as are delegated to the Agent by the terms hereof, together with such powers, including the discretionary rights and incidental power, as are reasonably incidental thereto; and (vi) such Assignee agrees that it will perform in accordance with their terms all of the obligations which by the terms of this Agreement are required to be performed by it as a Lender.

(d) Immediately upon satisfaction of the requirements of Section 11.2(a), this Agreement shall be deemed to be amended to the extent, but only to the extent, necessary to reflect the addition of the Assignee and the resulting adjustment of the Commitments arising therefrom. The Commitment allocated to each Assignee shall reduce such Commitments of the assigning Lender pro tanto.

(e) Any Lender may at any time sell to one or more commercial banks, financial institutions, or other Persons not Affiliates of any Borrower (a “Participant”) participating interests in any Loans, the Commitment of that Lender and the other interests of that Lender (the “Originating Lender”) hereunder and under the other Loan Documents; provided, however, that (i) the Originating Lender’s obligations under this Agreement shall remain unchanged; (ii) the Originating Lender shall remain solely responsible for the performance of such obligations; (iii) the Borrowers and the Agent shall continue to deal solely and directly with the Originating Lender in connection with the Originating Lender’s rights and obligations under this Agreement and the other Loan Documents; and (iv) no Lender shall transfer or grant any participating interest under which the Participant has rights to approve any amendment to, or any consent or waiver with respect to, this Agreement or any other Loan Document, except the matters set forth in Section 11.1(a)(i), (ii), and (iii), and all amounts payable by the Loan Parties hereunder shall be determined as if such Lender had not sold such participation; except that, if amounts outstanding under this Agreement are due and unpaid, or shall have become due and payable upon the occurrence of an Event of Default, each Participant shall be deemed to have the right of set off in respect of its participating interest in amounts owing under this Agreement to the same extent and subject to the same limitation as if the amount of its participating interest were owing directly to it as a Lender under this Agreement.

(f) If at any time any Lender which has issued any Letters of Credit which remain outstanding, assigns all of its Commitment, it shall retain all the rights, powers, privileges, and duties of a Letter of Credit Issuer hereunder with respect to all Letters of Credit outstanding as of the effective date of its assignment of its Commitment and all Letter-of Credit Rights with respect thereto (including the right to require the Lenders to make Base Rate Loans pursuant to Section 1.3). In the event any other Lender issues any Letter of Credit in substitution for any outstanding Letter of Credit issued by any Lender which ceases to be a Lender hereunder, the successor Letter of Credit Issuer shall succeed to the rights and obligations of the original Letter of Credit Issuer.

(g) Notwithstanding any other provision in this Agreement, any Lender may at any time create a security interest in, or pledge, all or any portion of its rights under and interest in this Agreement in favor of any Federal Reserve Bank in accordance with Regulation A of the FRB or U.S. Treasury Regulation 31 CFR §203.14, and such Federal Reserve Bank may enforce such pledge or security interest in any manner permitted under applicable law.

(h) No assignment or participation may be made to a Borrower, Affiliate of a Borrower, Defaulting Lender or natural person. In connection with any assignment by a Defaulting Lender, such assignment shall be effective only upon payment by the Eligible Assignee or Defaulting Lender to the Agent of an aggregate amount sufficient, upon distribution (through direct payment, purchases of participations or other compensating actions as the Agent deems appropriate), (a) to satisfy all funding and payment liabilities then owing by the Defaulting Lender hereunder, and (b) to acquire its Pro Rata Share of all Revolving Loans and Letter of Credit Obligations. If an assignment by a Defaulting Lender shall become effective under applicable Requirement of Law for any reason without compliance with the foregoing sentence, then the assignee shall be deemed a Defaulting Lender for all purposes until such compliance occurs.

ARTICLE 12.

THE AGENT

12.1 Appointment and Authorization. Each Lender hereby designates and appoints the Bank as its Agent under this Agreement and the other Loan Documents and each Lender hereby irrevocably authorizes the Agent to take such action on its behalf under the provisions of this Agreement and each other Loan Document and to exercise such powers and perform such duties as are expressly delegated to it by the terms of this Agreement or any other Loan Document, together with such powers as are reasonably incidental thereto. The Agent agrees to act as such on the express conditions contained in this Article 12. The provisions of this Article 12 are solely for the benefit of the Agent and the Lenders and no Borrower shall have any rights as a third party beneficiary of any of the provisions contained herein. Notwithstanding any provision to the contrary contained elsewhere in this Agreement or in any other Loan Document, the Agent shall not have any duties or responsibilities, except those expressly set forth herein, nor shall the Agent have or be deemed to have any fiduciary relationship with any Lender, and no implied covenants, functions, responsibilities, duties, obligations or liabilities shall be read into this Agreement or any other Loan Document or otherwise exist against the Agent. Without limiting the generality of the foregoing sentence, the use of the term “agent” in this Agreement with reference to the Agent is not intended to connote any fiduciary or other implied (or express) obligations arising under agency doctrine of any applicable law. Instead, such term is used merely as a matter of market custom, and is intended to create or reflect only an administrative relationship between independent contracting parties. Except as expressly otherwise provided in this Agreement, the Agent shall have and may use its sole discretion with respect to exercising or refraining from exercising any discretionary rights or taking or refraining from taking any actions which the Agent is expressly entitled to take or assert under this Agreement and the other Loan Documents, including (a) the determination of the applicability of ineligibility criteria with respect to the calculation of the Borrowing Base, (b) the making of Agent Advances pursuant to Section 1.2(i), and (c) the exercise of remedies pursuant to Section 9.2, and any action so taken or not taken shall be deemed consented to by the Lenders.

12.2 Delegation of Duties. The Agent may execute any of its duties under this Agreement or any other Loan Document by or through agents, employees, or attorneys in fact and shall be entitled to advice of counsel concerning all matters pertaining to such duties. The Agent shall not be responsible for the negligence or misconduct of any agent or attorney in fact that it selects as long as such selection was made without gross negligence or willful misconduct.

12.3 Liability of Agent. None of the Agent Related Persons shall (a) be liable for any action taken or omitted to be taken by any of them under or in connection with this Agreement or any other Loan Document or the transactions contemplated hereby (except for its own gross negligence or willful misconduct), or (b) be responsible in any manner to any of the Lenders for any recital, statement, representation, or warranty made by any Borrower, any Affiliate of any Borrower, or any officer thereof, contained in this Agreement or in any other Loan Document, or in any certificate, report, statement or other document referred to or provided for in, or received by the Agent under or in connection with, this Agreement or any other Loan Document, or the validity, effectiveness, genuineness, enforceability, or sufficiency of this Agreement or any other Loan Document, or for any failure of any Borrower or any other party to any Loan Document to perform its obligations hereunder or thereunder. No Agent Related Person shall be under any obligation to any Lender to ascertain or to inquire as to the observance or performance of any of the agreements contained in, or conditions of, this Agreement or any other Loan Document, or to inspect the properties, books, or records of any Borrower or any Affiliates of any Borrower.

12.4 Reliance by Agent. The Agent shall be entitled to rely, and shall be fully protected in relying, upon any writing, resolution, notice, consent, certificate, affidavit, letter, telegram, facsimile,

telex or telephone message, statement or other document, or conversation believed by it to be genuine and correct and to have been signed, sent, or made by the proper Person or Persons, and upon advice and statements of legal counsel (including counsel to any Borrower), independent accountants and other experts selected by the Agent. The Agent shall be fully justified in failing or refusing to take any action under this Agreement or any other Loan Document unless it shall first receive such advice or concurrence of the Required Lenders as it deems appropriate and, if it so requests, it shall first be indemnified to its satisfaction by the Lenders against any and all liability and expense which may be incurred by it by reason of taking or continuing to take any such action. The Agent shall in all cases be fully protected in acting, or in refraining from acting, under this Agreement or any other Loan Document in accordance with a request or consent of the Required Lenders (or all Lenders if so required by Section 11.1) and such request and any action taken or failure to act pursuant thereto shall be binding upon all of the Lenders.

12.5 Notice of Default. The Agent shall not be deemed to have knowledge or notice of the occurrence of any Default or Event of Default, unless the Agent shall have received written notice from a Lender or the Borrowers referring to this Agreement, describing such Default or Event of Default and stating that such notice is a “notice of default.” The Agent will notify the Lenders of its receipt of any such notice. The Agent shall take such action with respect to such Default or Event of Default as may be requested by the Required Lenders in accordance with Section 9; provided, however, that unless and until the Agent has received any such request, the Agent may (but shall not be obligated to) take such action, or refrain from taking such action, with respect to such Default or Event of Default as it shall deem advisable.

12.6 Credit Decision. Each Lender acknowledges that none of the Agent Related Persons has made any representation or warranty to it, and that no act by the Agent hereinafter taken, including any review of the affairs of the Borrowers and their Affiliates, shall be deemed to constitute any representation or warranty by any Agent-Related Person to any Lender. Each Lender represents to the Agent that it has, independently (without reliance upon any Agent-Related Person and based on such documents and information as it has deemed appropriate), made its own appraisal of and investigation into the business, prospects, operations, property, financial and other condition, and creditworthiness of the Borrowers and their Affiliates, and all applicable bank regulatory laws relating to the transactions contemplated hereby, and made its own decision to enter into this Agreement and to extend credit to the Borrowers. Each Lender also represents that it will, independently (without reliance upon any Agent-Related Person and based on such documents and information as it shall deem appropriate at the time), continue to make its own credit analysis, appraisals, and decisions in taking or not taking action under this Agreement and the other Loan Documents, and to make such investigations as it deems necessary to inform itself as to the business, prospects, operations, property, financial and other condition, and creditworthiness of the Borrowers. Except for notices, reports, and other documents expressly herein required to be furnished to the Lenders by the Agent, the Agent shall not have any duty or responsibility to provide any Lender with any credit or other information concerning the business, prospects, operations, property, financial and other condition, or creditworthiness of the Borrowers which may come into the possession of any of the Agent Related Persons.

12.7 Indemnification. Whether or not the transactions contemplated hereby are consummated, the Lenders shall indemnify upon demand the Agent Related Persons (to the extent not reimbursed by or on behalf of the Borrowers and without limiting the obligation of the Borrowers to do so), in accordance with their Pro Rata Shares, from and against any and all Indemnified Liabilities as such term is defined in Section 13.11; provided, however, that no Lender shall be liable for the payment to the Agent Related Persons of any portion of such Indemnified Liabilities resulting solely from such Person’s gross negligence or willful misconduct. Without limitation of the foregoing, each Lender shall reimburse the Agent upon demand for its Pro Rata Share of any costs or out of pocket expenses (including Attorney Costs) incurred by the Agent in connection with the preparation, execution, delivery, administration,

modification, amendment, or enforcement (whether through negotiations, legal proceedings, or otherwise) of, or legal advice in respect of rights or responsibilities under, this Agreement, any other Loan Document, or any document contemplated by or referred to herein, to the extent that the Agent is not reimbursed for such expenses by or on behalf of the Borrowers. The undertaking in this Section 12.7 shall survive the payment of all Obligations hereunder and the resignation or replacement of the Agent.

12.8 Agent in Individual Capacity. The Bank and its Affiliates may make loans to, issue letters of credit for the account of, accept deposits from, acquire Capital Stock in and generally engage in any kind of banking, trust, financial advisory, underwriting, or other business with the Borrowers and their Affiliates as though the Bank were not the Agent hereunder and without notice to or consent of the Lenders. The Bank or its Affiliates may receive information regarding the Borrowers, their Affiliates and Account Debtors (including information that may be subject to confidentiality obligations in favor of the Borrowers, Affiliates, or Account Debtors) and acknowledge that the Agent and the Bank shall be under no obligation to provide such information to them. With respect to its Revolving Loans, the Bank shall have the same rights and powers under this Agreement as any other Lender and may exercise the same as though it were not the Agent, and the terms “Lender” and “Lenders” include the Bank in its individual capacity.

12.9 Successor Agent. The Agent may resign as Agent upon at least thirty (30) days prior notice to the Lenders and the Borrowers, such resignation to be effective upon the acceptance of a successor agent to its appointment as Agent. In the event the Bank sells all of its Commitment and Revolving Loans as part of a sale, transfer or other disposition by the Bank of substantially all of its loan portfolio, the Bank shall resign as Agent and such purchaser or transferee shall become the successor Agent hereunder. Subject to the foregoing, if the Agent resigns under this Agreement, the Required Lenders shall appoint from among the Lenders a successor agent for the Lenders. If no successor agent is appointed prior to the effective date of the resignation of the Agent, the Agent may appoint, after consulting with the Lenders and Westlake, a successor agent from among the Lenders or, if no Lender accepts such role, the Agent may appoint Required Lenders as successor Agent. Upon the acceptance of its appointment as successor agent hereunder, or upon appointment of Required Lenders as successor Agent, (a) such successor agent shall succeed to all the rights, powers, and duties of the retiring Agent, (b) the term “Agent” shall mean such successor agent, (c) the retiring Agent’s appointment, powers, and duties as Agent shall be terminated. After any retiring Agent’s resignation hereunder as Agent, the provisions of this Article 12 shall continue to inure to its benefit as to any actions taken or omitted to be taken by it while it was Agent under this Agreement.

12.10 Collateral Matters.

(a) The Lenders hereby irrevocably authorize the Agent, at its option and in its sole discretion, to release any Agent’s Liens upon any Collateral (i) upon the termination of the Commitments and Full Payment of the Obligations (other than Bank Products that the applicable Lender chooses not to terminate and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination); (ii) constituting property being sold or disposed of if the Borrowers certify to the Agent that the sale or disposition is made in compliance with Section 7.9 (and the Agent may rely conclusively on any such certificate, without further inquiry); (iii) constituting property that is not Collateral in which the Loan Parties owned no interest at the time the Lien was granted or at any time thereafter; or (iv) constituting property leased to the Loan Parties under a lease which has expired or been terminated in a transaction permitted under this Agreement. Except as provided above, the Agent will not release any of the Agent’s Liens without the prior written authorization of the Lenders; provided that the Agent may, in its discretion, release the Agent’s Liens on Collateral valued in the aggregate not in excess of $5,000,000 during each Fiscal Year without the prior written authorization of the

Lenders and the Agent may release the Agent’s Liens on Collateral valued in the aggregate not in excess of $10,000,000 during each Fiscal Year with the prior written authorization of Required Lenders. Upon request by the Agent or the Borrowers at any time, the Lenders will confirm in writing the Agent’s authority to release any Agent’s Liens upon particular types or items of Collateral pursuant to this Section 12.10.

(b) Upon receipt by the Agent of any authorization required pursuant to Section 12.10(a) from the Lenders of the Agent’s authority to release Agent’s Liens upon particular types or items of Collateral, and upon at least five (5) Business Days’ prior written request by the Borrowers, the Agent shall (and is hereby irrevocably authorized by the Lenders to) execute such documents as may be necessary to evidence the release of the Agent’s Liens upon such Collateral; provided, however, that (i) the Agent shall not be required to execute any such document on terms which, in the Agent’s opinion, would expose the Agent to liability or create any obligation or entail any consequence other than the release of such Liens without recourse or warranty, and (ii) such release shall not in any manner discharge, affect or impair the Obligations or any Liens (other than those expressly being released) upon (or obligations of any Loan Party in respect of) all interests retained by any Loan Party, including the proceeds of any sale, all of which shall continue to constitute part of the Collateral.

(c) The Agent shall have no obligation whatsoever to any of the Lenders to assure that the Collateral exists or is owned by any Loan Party or is cared for, protected, or insured or has been encumbered, or that the Agent’s Liens have been properly or sufficiently or lawfully created, perfected, protected, or enforced or are entitled to any particular priority, or to exercise at all or in any particular manner or under any duty of care, disclosure, or fidelity, or to continue exercising, any of the rights, authorities, and powers granted or available to the Agent pursuant to any of the Loan Documents, it being understood and agreed that in respect of the Collateral, or any act, omission, or event related thereto, the Agent may act in any manner it may deem appropriate, in its sole discretion given the Agent’s own interest in the Collateral in its capacity as one of the Lenders and that the Agent shall have no other duty or liability whatsoever to any Lender as to any of the foregoing.

12.11 Restrictions on Actions by Lenders; Sharing of Payments.

(a) Each of the Lenders agrees that it shall not, unless specifically requested to do so by the Agent, take or cause to be taken any action to enforce its rights under this Agreement or against any Loan Party, including the commencement of any legal or equitable proceedings, to foreclose any Lien on, or otherwise enforce any security interest in, any of the Collateral.

(b) If at any time or times any Lender shall receive (i) by payment, foreclosure, setoff, or otherwise, any proceeds of Collateral or any payments with respect to the Obligations of any Loan Party to such Lender arising under, or relating to, this Agreement or the other Loan Documents, except for any such proceeds or payments received by such Lender from the Agent pursuant to the terms of this Agreement, or (ii) payments from the Agent in excess of such Lender’s ratable portion of all such distributions by the Agent, such Lender shall promptly (1) turn the same over to the Agent, in kind, and with such endorsements as may be required to negotiate the same to the Agent, or in same day funds, as applicable, for the account of all of the Lenders and for application to the Obligations in accordance with the applicable provisions of this Agreement, or (2) purchase, without recourse or warranty, an undivided interest and participation in the Obligations owed to the other Lenders so that such excess payment received shall be applied ratably as among the Lenders in accordance with their Pro Rata Shares; provided, however, that if all or part of such excess payment received by the purchasing party is thereafter

recovered from it, those purchases of participations shall be rescinded in whole or in part, as applicable, and the applicable portion of the purchase price paid therefor shall be returned to such purchasing party, but without interest except to the extent that such purchasing party is required to pay interest in connection with the recovery of the excess payment. Notwithstanding the foregoing, if a Defaulting Lender obtains a payment or reduction of any Obligation, it shall immediately turn over the amount thereof to the Agent for application under Section 12.14(e) and it shall provide a written statement to the Agent describing the Obligation affected by such payment or reduction.

12.12 Agency for Perfection. Each Lender hereby appoints each other Lender as agent for the purpose of perfecting the Lenders’ security interest in assets which, in accordance with Article 9 of the UCC can be perfected only by possession or control. Should any Lender (other than the Agent) obtain possession or control of any such Collateral, such Lender shall notify the Agent thereof, and, promptly upon the Agent’s request therefor shall deliver such Collateral or control thereof to the Agent or in accordance with the Agent’s instructions.

12.13 Payments by Agent to Lenders. All payments to be made by the Agent to the Lenders shall be made by bank wire transfer or internal transfer of immediately available funds to each Lender pursuant to wire transfer instructions delivered in writing to the Agent on or prior to the Closing Date (or if such Lender is an Assignee, on the applicable Assignment and Acceptance), or pursuant to such other wire transfer instructions as each party may designate for itself by written notice to the Agent. Concurrently with each such payment, the Agent shall identify whether such payment (or any portion thereof) represents principal, premium, or interest on the Revolving Loans or otherwise. Unless the Agent receives notice from the Borrowers prior to the date on which any payment is due to the Lenders that the Borrowers will not make such payment in full as and when required, the Agent may assume that the Borrowers have made such payment in full to the Agent on such date in immediately available funds and the Agent may (but shall not be so required), in reliance upon such assumption, distribute to each Lender on such due date an amount equal to the amount then due such Lender. If and to the extent the Borrowers have not made such payment in full to the Agent, each Lender shall repay to the Agent on demand such amount distributed to such Lender, together with interest thereon at the Federal Funds Rate for each day from the date such amount is distributed to such Lender until the date repaid.

12.14 Settlement.

(a) Each Lender’s funded portion of the Revolving Loans is intended by the Lenders to be equal at all times to such Lender’s Pro Rata Share of the outstanding Revolving Loans. Notwithstanding such agreement, the Agent, the Bank, and the other Lenders agree (which agreement shall not be for the benefit of or enforceable by any Borrower) that in order to facilitate the administration of this Agreement and the other Loan Documents, settlement among them as to the Revolving Loans, the Non-Ratable Loans and the Agent Advances shall take place on a periodic basis in accordance with the following provisions:

(i) The Agent shall request settlement (“Settlement”) with the Lenders on at least a weekly basis, or on a more frequent basis at the Agent’s election, (A) on behalf of the Bank, with respect to each outstanding Non-Ratable Loan, (B) for itself, with respect to each Agent Advance, and (C) with respect to collections received, in each case, by notifying the Lenders of such requested Settlement by telecopy, telephone or other similar form of transmission, of such requested Settlement, no later than 1:30 p.m. (Houston, Texas time) on the date of such requested Settlement (the “Settlement Date”). Each Lender (other than the Bank, in the case of Non-Ratable Loans and the Agent in the case of Agent Advances) shall transfer the amount of such Lender’s Pro Rata Share of the

outstanding principal amount of the Non-Ratable Loans and Agent Advances with respect to each Settlement to the Agent, to Agent’s account, not later than 3:30 p.m. (Houston, Texas time), on the Settlement Date applicable thereto. Settlements may occur during the continuation of a Default or an Event of Default and whether or not the applicable conditions precedent set forth in Article 8 have then been satisfied. Such amounts made available to the Agent shall be applied against the amounts of the applicable Non-Ratable Loan or Agent Advance and, together with the portion of such Non-Ratable Loan or Agent Advance representing the Bank’s Pro Rata Share thereof, shall constitute Revolving Loans of such Lenders. If any such amount is not transferred to the Agent by any Lender on the Settlement Date applicable thereto, the Agent shall be entitled to recover such amount on demand from such Lender together with interest thereon at the Federal Funds Rate for the first three (3) days from and after the Settlement Date and thereafter at the Interest Rate then applicable to the Revolving Loans (A) on behalf of the Bank, with respect to each outstanding Non-Ratable Loan, and (B) for itself, with respect to each Agent Advance. If any settlement amount is not transferred to the Agent by any Lender on the Business Day after demand, the Agent will notify the Borrowers of such Lender’s failure to transfer and, upon demand by the Agent, the Borrowers shall pay such amount to the Agent, together with interest thereon for each day elapsed since the date of the applicable advance, at a rate per annum equal to the Interest Rate applicable at the time to the Revolving Loans comprising that particular advance.

(ii) Notwithstanding the foregoing, not more than one (1) Business Day after demand is made by the Agent (whether before or after the occurrence of a Default or an Event of Default and regardless of whether the Agent has requested a Settlement with respect to a Non-Ratable Loan or Agent Advance), each other Lender (A) shall irrevocably and unconditionally purchase and receive from the Bank or the Agent, as applicable, without recourse or warranty, an undivided interest and participation in such Non-Ratable Loan or Agent Advance equal to such Lender’s Pro Rata Share of such Non-Ratable Loan or Agent Advance and (B) if Settlement has not previously occurred with respect to such Non-Ratable Loans or Agent Advances, upon demand by Bank or Agent, as applicable, shall pay to Bank or Agent, as applicable, as the purchase price of such participation an amount equal to one-hundred percent (100%) of such Lender’s Pro Rata Share of such Non-Ratable Loans or Agent Advances. If such amount is not in fact made available to the Agent by any Lender, the Agent shall be entitled to recover such amount on demand from such Lender together with interest thereon at the Federal Funds Rate for the first three (3) days from and after such demand and thereafter at the Interest Rate then applicable to Base Rate Loans.

(iii) From and after the date, if any, on which any Lender purchases an undivided interest and participation in any Non-Ratable Loan or Agent Advance pursuant to clause (ii) above, the Agent shall promptly distribute to such Lender, such Lender’s Pro Rata Share of all payments of principal and interest and all proceeds of Collateral received by the Agent in respect of such Non-Ratable Loan or Agent Advance.

(iv) Between Settlement Dates, the Agent, to the extent no Agent Advances are outstanding, may pay over to the Bank any payments received by the Agent, which in accordance with the terms of this Agreement would be applied to the reduction of the Revolving Loans, for application to the Bank’s Revolving Loans including Non-Ratable Loans. If, as of any Settlement Date, collections received since the then immediately preceding Settlement Date have been applied to the Bank’s Revolving Loans (other than

to Non-Ratable Loans or Agent Advances in which such Lender has not yet funded its purchase of a participation pursuant to clause (ii) above), as provided for in the previous sentence, the Bank shall pay to the Agent for the accounts of the Lenders, to be applied to the outstanding Revolving Loans of such Lenders, an amount such that each Lender shall, upon receipt of such amount, have, as of such Settlement Date, its Pro Rata Share of the Revolving Loans. During the period between Settlement Dates, the Bank with respect to Non-Ratable Loans, the Agent with respect to Agent Advances, and each Lender with respect to the Revolving Loans other than Non-Ratable Loans and Agent Advances, shall be entitled to interest at the applicable rate or rates payable under this Agreement on the actual average daily amount of funds employed by the Bank, the Agent, and the other Lenders, respectively.

(v) Unless the Agent has received written notice from a Lender to the contrary, the Agent may assume that the applicable conditions precedent set forth in Article 8 have been satisfied and the requested Borrowing will not exceed Availability on any Funding Date for a Revolving Loan or Non-Ratable Loan.

(b) Lenders’ Failure to Perform. All Revolving Loans (other than Non-Ratable Loans and Agent Advances) shall be made by the Lenders simultaneously and in accordance with their Pro Rata Shares. It is understood that (i) no Lender shall be responsible for any failure by any other Lender to perform its obligation to make any Revolving Loans hereunder, nor shall any Commitment of any Lender be increased or decreased as a result of any failure by any other Lender to perform its obligation to make any Revolving Loans hereunder, (ii) no failure by any Lender to perform its obligation to make any Revolving Loans hereunder shall excuse any other Lender from its obligation to make any Revolving Loans hereunder, and (iii) the obligations of each Lender hereunder shall be several, not joint and several.

(c) Defaulting Lenders. Unless the Agent receives notice from a Lender on or prior to the Closing Date or, with respect to any Borrowing after the Closing Date, at least one (1) Business Day prior to the date of such Borrowing, that such Lender will not make available as and when required hereunder to the Agent that Lender’s Pro Rata Share of a Borrowing, the Agent may assume that each Lender has made such amount available to the Agent in immediately available funds on the Funding Date. Furthermore, the Agent may, in reliance upon such assumption, make available to the Borrowers on such date a corresponding amount. If any Lender has not transferred its full Pro Rata Share to the Agent in immediately available funds and the Agent has transferred corresponding amount to the Borrowers on the Business Day following such Funding Date, that Lender shall make such amount available to the Agent, together with interest at the Federal Funds Rate for that day. A notice by the Agent submitted to any Lender with respect to amounts owing shall be conclusive, absent manifest error. If each Lender’s full Pro Rata Share is transferred to the Agent as required, the amount transferred to the Agent shall constitute that Lender’s Revolving Loan for all purposes of this Agreement. If that amount is not transferred to the Agent on the Business Day following the Funding Date, the Agent will notify the Borrowers of such failure to fund and, upon demand by the Agent, the Borrowers shall pay such amount to the Agent for the Agent’s account, together with interest thereon for each day elapsed since the date of such Borrowing, at a rate per annum equal to the Interest Rate applicable at the time to the Revolving Loans comprising that particular Borrowing. The failure of any Lender to make any Revolving Loan on any Funding Date shall not relieve any other Lender of its obligation hereunder to make a Revolving Loan on that Funding Date. No Lender shall be responsible for any other Lender’s failure to advance such other Lenders’ Pro Rata Share of any Borrowing.

(d) Reallocation of Pro Rata Share; Amendments. For purposes of determining Lenders’ obligations to fund or participate in the Revolving Loans or Letters of Credit, the Agent may exclude the Commitments and Revolving Loans of any Defaulting Lender(s) from the calculation of Pro Rata Shares. A Defaulting Lender shall have no right to vote on any amendment, waiver or other modification of a Loan Document, except as provided in Section 11.1.

(e) Payments; Fees. The Agent may, in its discretion, receive and retain any amounts payable to a Defaulting Lender under the Loan Documents, and a Defaulting Lender shall be deemed to have assigned to the Agent such amounts until all Obligations owing to the Agent, non-Defaulting Lenders and other Secured Parties have been paid in full. The Agent may apply such amounts to the Defaulting Lender’s defaulted obligations, use the funds to cash collateralize such Lender’s Fronting Exposure, or readvance the amounts to the Borrowers hereunder. A Lender shall not be entitled to receive any fees accruing hereunder during the period in which it is a Defaulting Lender, and the unfunded portion of its Commitment shall be disregarded for purposes of calculating the unused line fee under Section 2.5. If any Letter of Credit Obligations owing to a Defaulted Lender are reallocated to other Lenders, fees attributable to such Letter of Credit Obligations under Section 2.6 shall be paid to such Lenders. The Agent shall be paid all fees attributable to the Letter of Credit Obligations that are not reallocated.

(f) Cure. The Borrowers, the Agent and the Letter of Credit Issuers may agree in writing that a Lender is no longer a Defaulting Lender. At such time, Pro Rata Shares shall be reallocated without exclusion of such Lender’s Commitments and Revolving Loans, and all outstanding Revolving Loans, Letter of Credit Obligations and other exposures hereunder shall be reallocated among the Lenders and settled by the Agent (with appropriate payments by the reinstated Lender) in accordance with the readjusted Pro Rata Shares. Unless expressly agreed by the Borrowers, the Agent and the Letter of Credit Issuers, no reinstatement of a Defaulting Lender shall constitute a waiver or release of claims against such Lender. The failure of any Lender to fund a Revolving Loan, to make a payment in respect of Letter of Credit Obligations or otherwise to perform its obligations hereunder shall not relieve any other Lender of its obligations, and no Lender shall be responsible for default by another Lender.

12.15 Concerning the Collateral and the Related Loan Documents. Each Lender authorizes and directs the Agent to enter into the other Loan Documents, for the ratable benefit and obligation of the Agent and the Lenders, and to amend the Schedules to the Loan Documents without a separate amendment to this Agreement or the other Loan Documents signed by the requisite Lenders if the underlying transactions necessitating such amendments of the Schedules are permitted under this Agreement or the other Loan Documents. Each Lender agrees that any action taken by the Agent, Majority Lenders, or Required Lenders, as applicable, in accordance with the terms of this Agreement or the other Loan Documents, and the exercise by the Agent, the Majority Lenders, or the Required Lenders, as applicable, of their respective powers set forth therein or herein, together with such other powers that are reasonably incidental thereto, shall be binding upon all of the Lenders. The Lenders acknowledge that the Revolving Loans, Agent Advances, Non-Ratable Loans, Bank Products, and all interest, fees and expenses hereunder constitute one Debt, secured pari passu by all of the Collateral.

12.16 Field Audit and Examination Reports; Disclaimer by Lenders. By signing this Agreement, each Lender:

(a) is deemed to have requested that the Agent furnish such Lender, promptly after it becomes available, a copy of each field audit or examination report (each a “Report” and collectively, “Reports”) prepared by or on behalf of the Agent;

(b) expressly agrees and acknowledges that neither the Bank nor the Agent (i) makes any representation or warranty as to the accuracy of any Report, or (ii) shall be liable for any information contained in any Report;

(c) expressly agrees and acknowledges that the Reports are not comprehensive audits or examinations, that the Agent or the Bank or other party performing any audit or examination will inspect only specific information regarding the Borrowers and will rely significantly upon the Borrowers’ books and records, as well as on representations of the Borrowers’ personnel;

(d) agrees to keep all Reports confidential and strictly for its internal use, and not to distribute except to its participants, or use any Report in any other manner; and

(e) without limiting the generality of any other indemnification provision contained in this Agreement, agrees: (i) to hold the Agent and any such other Lender preparing a Report harmless from any action the indemnifying Lender may take or conclusion the indemnifying Lender may reach or draw from any Report in connection with any loans or other credit accommodations that the indemnifying Lender has made or may make to the Borrowers, or the indemnifying Lender’s participation in, or the indemnifying Lender’s purchase of, a loan or loans of the Borrower; and (ii) to pay and protect, and indemnify, defend and hold the Agent and any such other Lender preparing a Report harmless from and against, the claims, actions, proceedings, damages, costs, expenses, and other amounts (including Attorney Costs) incurred by the Agent and any such other Lender preparing a Report as the direct or indirect result of any third parties who might obtain all or part of any Report through the indemnifying Lender.

12.17 Relation Among Lenders. The Lenders are not partners or co-venturers, and no Lender shall be liable for the acts or omissions of, or (except as otherwise set forth herein in case of the Agent) authorized to act for, any other Lender. No Lender or any Affiliate of any Lender that obtains the benefits of Section 7.23 by virtue of the provisions hereof or of any Guaranty or Security Agreement, shall have the right to notice of any action or to consent to, direct or object to any action hereunder or under any other Loan Document or otherwise in respect of the Collateral (including the release or impairment of any Collateral) other than in its capacity as a Lender and, in such case, only to the extent expressly provided in the Loan Documents. Notwithstanding any other provision of this Agreement or any other Loan Document to the contrary, the Agent shall not be required to verify the payment of, or that other satisfactory arrangements have been made, with respect to, Obligations arising under any Bank Product.

12.18 Co-Agents. None of the Lenders identified on the facing page or signature pages of this Agreement as a “co-agent” or “documentation agent” (if any) shall have any right, power, obligation, liability, responsibility or duty under this Agreement other than those applicable to all Lenders as such. Without limiting the foregoing, none of the Lenders so identified as a “co-agent” or “documentation agent” (if any) shall have or be deemed to have any fiduciary relationship with any Lender. Each Lender acknowledges that it has not relied, and will not rely, on any of the Lenders so identified in deciding to enter into this Agreement or in taking or not taking action hereunder.

12.19 Bank Product Providers. Each provider of the Bank Products, by delivery of a notice to the Agent of the existence or increase of a Bank Product, agrees to be bound by Section 7.23 and this Section 12.19. Each provider of any Bank Product shall indemnify and hold harmless the Agent-Related Persons, to the extent not reimbursed by the Loan Parties, against any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, charges, expenses, and disbursements (including Attorney Costs) of any kind or nature whatsoever that may be incurred by or asserted against any Agent-Related Person in connection with such provider’s Bank Product obligations.

ARTICLE 13.

MISCELLANEOUS

13.1 No Waivers; Cumulative Remedies. No failure by the Agent or any Lender to exercise any right, remedy, or option under this Agreement or any present or future supplement thereto, or in any other agreement between or among any Borrower and the Agent and/or any Lender, or delay by the Agent or any Lender in exercising the same, will operate as a waiver thereof. No waiver by the Agent or any Lender will be effective unless it is in writing, and then only to the extent specifically stated. No waiver by the Agent or the Lenders on any occasion shall affect or diminish the Agent’s and each Lender’s rights thereafter to require strict performance by the Borrowers of any provision of this Agreement. The Agent and the Lenders may proceed directly to collect the Obligations without any prior recourse to the Collateral. The Agent’s and each Lender’s rights under this Agreement will be cumulative and not exclusive of any other right or remedy which the Agent or any Lender may have.

13.2 Severability. The illegality or unenforceability of any provision of this Agreement or any Loan Document or any instrument or agreement required hereunder shall not in any way affect or impair the legality or enforceability of the remaining provisions of this Agreement or any instrument or agreement required hereunder.

13.3 Governing Law; Choice of Forum; Service of Process.

(a) The Loan Documents have been entered into pursuant to Section 5-1401 of the New York General Obligations Law and the substantive laws of the State of New York (except to the extent the laws of another jurisdiction govern the creation, perfection, validity, or enforcement of Liens under the Collateral Documents), and the applicable federal laws of the United States of America shall govern the validity, construction, enforcement and interpretation of the Loan Documents.

(b) Each party hereto (including each Guarantor by execution of an Obligation Guaranty), in each case for itself, its successors and assigns, hereby (A) irrevocably submits to the nonexclusive jurisdiction of the state (pursuant to Section 5-1402 of the New York General Obligations Law) and federal courts located in the Borough of Manhattan in the State of New York, and agrees and consents that service of process may be made upon it in any legal proceeding arising out of or in connection with the Loan Documents and the Obligations by service of process as provided by New York law, (B) irrevocably waives, to the fullest extent permitted by law, any objection which it may now or hereafter have to the laying of venue of any litigation arising out of or in connection with the Loan Documents and the Obligations brought in any such court, (C) irrevocably waives to the fullest extent permitted by law any claims that any litigation brought in any such court has been brought in an inconvenient forum, (D) agrees to designate and maintain an agent for service of process in New York in connection with any such litigation and to deliver to the Agent evidence thereof, if requested, and (E) irrevocably agrees to the fullest extent permitted by law that any legal proceeding against any party hereto arising out of or in connection with the Loan Documents or the Obligations shall be brought in one of the aforementioned courts. The scope of each of the foregoing waivers is intended to be all-encompassing of any and all disputes that may be filed in any court and that relate to the subject matter of this transaction, including, without limitation, contract claims, tort claims, breach of duty claims, and all other common law and statutory claims. The Loan Parties and each other party to the Loan Documents acknowledge that this waiver is a material inducement to the agreement of each party hereto to enter into a business relationship, that each has already relied on this waiver in entering into the Loan Documents, and each will continue to rely on each of such waivers in related future dealings. The Loan Parties and each other party to the Loan

Documents warrant and represent that they have reviewed these waivers with their legal counsel, and that they knowingly and voluntarily agree to each such waiver following consultation with legal counsel. THE WAIVERS IN THIS SECTION 13.3 ARE IRREVOCABLE, MEANING THAT THEY MAY NOT BE MODIFIED EITHER ORALLY OR IN WRITING, AND THESE WAIVERS SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, SUPPLEMENTS, AND REPLACEMENTS TO OR OF THIS OR ANY OTHER LOAN DOCUMENT. In the event of litigation, this Agreement may be filed as a written consent to a trial by the court. Notwithstanding the foregoing: (1) the Agent and the Lenders shall have the right to bring any action or proceeding against any Loan Party or their property in the courts of any other jurisdiction the Agent or the Lenders deem necessary or appropriate in order to realize on the Collateral or other security for the Obligations and (2) each of the parties hereto acknowledges that any appeals from the courts described in the immediately preceding sentence may have to be heard by a court located outside those jurisdictions.

(c) EACH BORROWER AND EACH OTHER LOAN PARTY (BY EXECUTION OF AN OBLIGATION GUARANTY) HEREBY WAIVES PERSONAL SERVICE OF ANY AND ALL PROCESS UPON IT AND CONSENTS THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY REGISTERED MAIL (RETURN RECEIPT REQUESTED) DIRECTED TO WESTLAKE AT ITS ADDRESS SET FORTH IN SECTION 13.8 AND SERVICE SO MADE SHALL BE DEEMED TO BE COMPLETED UPON THE EARLIER OF (I) TWO (2) DAYS AFTER THE SAME SHALL HAVE BEEN SO DEPOSITED WITH A NATIONALLY-RECOGNIZED OVERNIGHT COURIER OR (II) WHEN ACTUALLY DELIVERED TO SUCH PERSON. NOTHING CONTAINED HEREIN SHALL AFFECT THE RIGHT OF THE AGENT OR THE LENDERS TO SERVE LEGAL PROCESS BY ANY OTHER MANNER PERMITTED BY LAW.

13.4 WAIVER OF JURY TRIAL. EACH BORROWER AND EACH OTHER LOAN PARTY (BY EXECUTION OF AN OBLIGATION GUARANTY). THE LENDERS, AND THE AGENT EACH IRREVOCABLY WAIVE THEIR RESPECTIVE RIGHTS TO A TRIAL BY JURY OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF OR RELATED TO THIS AGREEMENT, THE OTHER LOAN DOCUMENTS, OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY, IN ANY ACTION, PROCEEDING, OR OTHER LITIGATION OF ANY TYPE BROUGHT BY ANY SUCH PARTIES AGAINST ANY OTHER SUCH PARTY OR ANY AGENT-RELATED PERSON, PARTICIPANT, OR ASSIGNEE, WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS, OR OTHERWISE. EACH BORROWER, THE LENDERS, AND THE AGENT EACH AGREE THAT ANY SUCH CLAIM OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY. WITHOUT LIMITING THE FOREGOING, THE PARTIES FURTHER AGREE THAT THEIR RESPECTIVE RIGHT TO A TRIAL BY JURY IS WAIVED BY OPERATION OF THIS SECTION AS TO ANY ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART, TO CHALLENGE THE VALIDITY OR ENFORCEABILITY OF THIS AGREEMENT, THE OTHER LOAN DOCUMENTS, OR ANY PROVISION HEREOF OR THEREOF. THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS, OR MODIFICATIONS TO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS.

13.5 Survival of Representations and Warranties. All of the Borrowers’ representations and warranties contained in this Agreement shall survive the execution, delivery, and acceptance thereof by the parties, notwithstanding any investigation by the Agent or the Lenders or their respective agents.

13.6 Other Security and Guaranties. The Agent, may, without notice or demand and without affecting any Borrower’s obligations hereunder, from time to time: (a) take from any Person and

hold collateral (other than the Collateral) for the payment of all or any part of the Obligations and exchange, enforce, or release such collateral or any part thereof; and (b) accept and hold any endorsement or guaranty of payment of all or any part of the Obligations and release or substitute any such endorser or guarantor, or any Person who has given any Lien in any other collateral as security for the payment of all or any part of the Obligations, or any other Person in any way obligated to pay all or any part of the Obligations.

13.7 Fees and Expenses. The Borrowers agree to pay to the Agent and the Arranger (as applicable), for their respective benefits, on demand, all reasonable costs and expenses that the Agent or the Arranger pays or incurs in connection with the negotiation, preparation, syndication, consummation, administration, enforcement, and termination of this Agreement or any of the other Loan Documents, including: (a) Attorney Costs and costs and expenses of auditors, accountants, consultants or appraisers hired by the Agent; (b) costs and expenses (including, without duplication, attorneys’ and paralegals’ fees and disbursements) for any amendment, supplement, waiver, consent, or subsequent closing in connection with the Loan Documents and the transactions contemplated thereby; (c) costs and expenses of lien searches; (d) taxes, fees, and other charges for recording any mortgages, filing financing statements, amendments, and continuations, and other actions to perfect, protect, and continue the Agent’s Liens (including costs and expenses paid or incurred by the Agent in connection with the consummation of the Agreement); (e) sums paid or incurred to pay any amount or take any action reasonably required of any Borrower under the Loan Documents that Borrowers fail to pay or take; (f) costs of appraisals, inspections, and verifications of the Collateral, including travel, lodging, and meals for inspections of the Collateral and the Loan Parties’ operations by the Agent plus the Agent’s then customary charge for field examinations and audits and the preparation of reports thereof (such charge is currently $1,000 per day (or portion thereof) for each Person retained or employed by the Agent with respect to each field examination or audit); and (g) costs and expenses of forwarding loan proceeds, collecting checks, and other items of payment, and establishing and maintaining Payment Accounts and lock boxes, and costs and expenses of preserving and protecting the Collateral. In addition, the Borrowers agree to pay costs and expenses incurred by the Agent, the Arranger, the Letter of Credit Issuers, and the Lenders (including Attorneys’ Costs and attorneys’ fees of each Lender) to the Agent, the Arranger, the Letter of Credit Issuers, and the Lenders, as applicable, for their respective benefit, on demand, and all reasonable fees, expenses and disbursements incurred by the Agent, the Arranger, the Letter of Credit Issuers, and the Lenders for any law firm retained by the Agent, the Arranger, any Letter of Credit Issuer, or any Lender, in each case, paid or incurred to obtain payment of the Obligations, enforce the Agent’s Liens, sell or otherwise realize upon the Collateral, and otherwise enforce the provisions of the Loan Documents, or to defend any claims made or threatened against the Agent, the Arranger, any Letter of Credit Issuer, or any Lender arising out of the transactions contemplated hereby (including preparations for and consultations concerning any such matters). The foregoing shall not be construed to limit any other provisions of the Loan Documents regarding costs and expenses to be paid by the Borrowers. All of the foregoing costs and expenses may be (in the sole discretion of the Agent) charged to the Borrowers’ Loan Account as Revolving Loans as described in Section 3.7 up to the Maximum Revolver Amount. Except as provided in clause (d) above, this Section 13.7 shall not apply to Taxes, which shall be covered solely by Sections 4.1 and 4.3.

13.8 Notices. Except as otherwise provided herein, all notices, demands and requests that any party is required or elects to give to any other shall be in writing, or by a telecommunications device capable of creating a written record, and any such notice shall become effective (a) on the earlier of (i) two (2) days after the same shall have been so deposited with a nationally-recognized overnight courier or (ii) when actually delivered to such person, (b) four (4) days after it shall have been mailed by United States mail, first class, certified or registered, with postage prepaid, or (c) in the case of notice by such a telecommunications device, when properly transmitted, in each case addressed to the party to be notified as follows:

If to the Agent or to the Bank:

Bank of America, N.A.

▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇, ▇▇^▇▇ ▇▇▇▇▇

▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇

Attention: Portfolio Manager

Facsimile No.: 312.453.3558

with copies to:

▇▇▇▇▇▇ and ▇▇▇▇▇, LLP

▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇

▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇

Attention: ▇▇▇ ▇. ▇▇▇▇▇▇

Facsimile No.: 214.200.0565

If to the Borrowers:

Westlake Chemical Corporation

▇▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇▇▇

▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇

Attention: Treasurer

Facsimile No.: 713.960.9420

with copies to:

Westlake Chemical Corporation

▇▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇▇▇

▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇

Attention: General Counsel

Facsimile No.: 713.926.6239

or to such other address as each party may designate for itself by like notice. Failure or delay in delivering copies of any notice, demand, request, consent, approval, declaration or other communication to the persons designated above to receive copies shall not adversely affect the effectiveness of such notice, demand, request, consent, approval, declaration or other communication. All notices and requests given to any Lender other than the Bank shall be given to the address, telecopier number, electronic mail address or telephone number specified in its administrative questionnaire, or such other address as such Lender may notify the Agent in writing.

13.9 Waiver of Notices. Unless otherwise expressly provided herein, each Borrower waives presentment, and notice of demand or dishonor and protest as to any instrument, notice of intent to accelerate the Obligations, and notice of acceleration of the Obligations, as well as any and all other notices to which it might otherwise be entitled. No notice to or demand on any Borrower which the Agent or any Lender may elect to give shall entitle any Borrower to any or further notice or demand in the same, similar, or other circumstances.

13.10 Binding Effect. The provisions of this Agreement shall be binding upon and inure to the benefit of the respective representatives, successors, and assigns of the parties hereto; provided, however, that no interest herein may be assigned by any Borrower without prior written consent of the Agent and each Lender. The rights and benefits of the Agent and the Lenders hereunder shall, if such Persons so agree, inure to any party acquiring any interest in the Obligations or any part thereof.

13.11 Indemnity of the Agent, the Arranger, the Letter of Credit Issuers and the Lenders by the Borrowers.

(a) Each Borrower and each other Loan Party (by execution of an Obligation Guaranty) agrees to defend, indemnify, and hold the Agent-Related Persons, the Arranger, each Letter of Credit Indemnitee, each Lender and each of their respective Affiliates, officers, directors, employees, counsel, representatives, agents, and attorneys in fact (each, an “Indemnified Person”) harmless from and against any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, charges, expenses, and disbursements (including Attorney Costs) of any kind or nature whatsoever which may at any time (including at any time following repayment of the Revolving Loans and the termination, resignation, or replacement of the Agent or replacement of any Lender) be imposed on, incurred by, or asserted against any such Person in any way relating to or arising out of this Agreement or any document contemplated by or referred to herein, or the transactions contemplated hereby, or any action taken or omitted by any such Person under or in connection with any of the foregoing, including with respect to any investigation, litigation, or proceeding (including any insolvency proceeding or appellate proceeding) related to or arising out of this Agreement, any other Loan Document, or the Revolving Loans or the use of the proceeds thereof, whether or not any Indemnified Person is a party thereto (all the foregoing, collectively, the “Indemnified Liabilities”), IN ALL CASES, WHETHER OR NOT CAUSED BY OR ARISING, IN WHOLE OR IN PART, OUT OF THE COMPARATIVE, CONTRIBUTORY OR SOLE NEGLIGENCE OF THE INDEMNIFIED PERSON; provided, that the Borrowers shall have no obligation hereunder to any Indemnified Person with respect to Indemnified Liabilities to the extent resulting from the gross negligence or willful misconduct of such Indemnified Person. The agreements in this Section shall survive payment of all other Obligations. This Section 13.11(a) shall not apply to Taxes, which shall be covered solely by Sections 4.1, 4.3 and 13.7(d).

(b) Each Borrower and each other Loan Party (by execution of an Obligation Guaranty) agrees to indemnify, defend, and hold harmless the Agent, the Letter of Credit Indemnitees and the Lenders from any Environmental Liability, arising directly or indirectly, in whole or in part, out of any breach of this Agreement, including without limitation, any breach of Section 6.14 or Section 7.7 by any Loan Party. This indemnity will apply whether the Hazardous Material is on, under, or about any Real Estate or operations or property leased to, or formerly owned or operated by, any Loan Party or any of their Subsidiaries. The indemnity includes, but is not limited to, Attorneys Costs. The indemnity extends to the Agent and the Lenders, their parents, affiliates, subsidiaries, and all of their directors, officers, employees, agents, successors, attorneys, and assigns. This indemnity will survive repayment of all other Obligations. This indemnity is intended to allocate responsibility between the Loan Parties and the Agent and the Lenders as contemplated by Section 107(e)(1) of CERCLA and any successor federal statute, rule, or regulations or comparable state statute, rule, or regulations.

13.12 Limitation of Liability. NO CLAIM MAY BE MADE BY ANY LOAN PARTY, ANY LENDER, OR OTHER PERSON AGAINST THE AGENT, THE ARRANGER, ANY LENDER, OR THE AFFILIATES, DIRECTORS, OFFICERS, EMPLOYEES, COUNSEL, REPRESENTATIVES, AGENTS, OR ATTORNEYS-IN-FACT OF ANY OF THEM FOR ANY SPECIAL, INDIRECT, CONSEQUENTIAL, OR PUNITIVE DAMAGES IN RESPECT OF ANY CLAIM FOR BREACH OF CONTRACT OR ANY OTHER THEORY OF LIABILITY ARISING OUT OF OR RELATED TO THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY ACT, OMISSION, OR EVENT OCCURRING IN CONNECTION THEREWITH, AND EACH BORROWER AND EACH OTHER LOAN PARTY (BY EXECUTION OF AN OBLIGATION GUARANTY) AND EACH LENDER HEREBY WAIVES, RELEASES, AND AGREES NOT TO ▇▇▇ UPON ANY CLAIM FOR SUCH DAMAGES, WHETHER OR NOT ACCRUED AND WHETHER OR NOT KNOWN OR SUSPECTED TO EXIST IN ITS FAVOR.

13.13 No Advisory or Fiduciary Responsibility. In connection with all aspects of each transaction contemplated by any Loan Document, the Borrowers acknowledge and agree that (a)(i) this credit facility and any related arranging or other services by the Agent, any Lender, any of their Affiliates or any arranger are arm’s-length commercial transactions between the Borrowers and such Person; (ii) the Borrowers have consulted their own legal, accounting, regulatory and tax advisors to the extent they have deemed appropriate; and (iii) the Borrowers are capable of evaluating, and understand and accept, the terms, risks and conditions of the transactions contemplated by the Loan Documents; (b) each of the Agent, the Lenders, their Affiliates and any arranger is and has been acting solely as a principal and, except as expressly agreed in writing by the relevant parties, has not been, is not, and will not be acting as an advisor, agent or fiduciary for the Borrowers, any of their Affiliates or any other Person, and has no obligation with respect to the transactions contemplated by the Loan Documents except as expressly set forth therein; and (c) the Agent, the Lenders, their Affiliates and any arranger may be engaged in a broad range of transactions that involve interests that differ from those of the Borrowers and their Affiliates, and have no obligation to disclose any of such interests to the Borrowers or their Affiliates. To the fullest extent permitted by applicable Law, each Borrower hereby waives and releases any claims that it may have against the Agent, the Lenders, their Affiliates and any arranger with respect to any breach of agency or fiduciary duty in connection with any transaction contemplated by a Loan Document.

13.14 Final Agreement. THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. No modification, rescission, waiver, release, or amendment of any provision of this Agreement or any other Loan Document shall be made, except by a written agreement signed by the Borrowers and a duly authorized officer of each of the Agent and the requisite Lenders.

13.15 Counterparts. This Agreement may be executed in any number of counterparts, and by the Agent, each Lender, and each Borrower in separate counterparts, each of which shall be an original, but all of which shall together constitute one and the same agreement; signature pages may be detached from multiple separate counterparts and attached to a single counterpart so that all signature pages are physically attached to the same document.

13.16 Captions. The captions contained in this Agreement are for convenience of reference only, are without substantive meaning and should not be construed to modify, enlarge, or restrict any provision.

13.17 Right of Setoff. In addition to any rights and remedies of the Lenders provided by law, if an Event of Default exists or the Revolving Loans have been accelerated, the Agent, each Letter of Credit Issuer, each Lender, and any of their respective Affiliates are authorized at any time and from time to time, without prior notice to any Loan Party, any such notice being waived by each Loan Party to the fullest extent permitted by law, to set off and apply any and all deposits (general or special, time or demand, provisional or final) at any time held by, and other indebtedness at any time owing by, the Agent, such Letter of Credit Issuer, such Lender, or such Affiliate to or for the credit or the account of any Loan Party against any and all Obligations (for the benefit of all Lenders as provided herein), now or hereafter existing, irrespective of whether or not the Agent, such Letter of Credit Issuer or such Lender shall have made demand under this Agreement or any Loan Document and although such Obligations may be contingent or unmatured. Each Letter of Credit Issuer and each Lender agree to promptly notify the Borrowers and the Agent after any such setoff and application made by such Letter of Credit Issuer or

such Lender; provided, however, that the failure to give such notice shall not affect the validity of such set off and application. If any Lender shall obtain any payment or prepayment with respect to the Obligation as a result of exercising its right under this Section 13.16 which is in excess of its share of any such payment in accordance with the relevant rights of the Lenders under the Loan Documents, then such Lender shall purchase from the other Lenders such participations as shall be necessary to cause such purchasing Lender to share the excess payment with each other Lender in accordance with the relevant rights under the Loan Documents. If all or any portion of such excess payment is subsequently recovered from such purchasing Lender, then the purchase shall be rescinded and the purchase price restored to the extent of such recovery. Each Loan Party agrees that any Lender purchasing a participation from another Lender pursuant to this Section may, to the fullest extent permitted by law, exercise all of its rights of payment (including the right of offset) with respect to such participation as fully as if such Lender were the direct creditor of such Loan Party in the amount of such participation.

13.18 Confidentiality.

(a) Each Borrower hereby consents that the Agent and each Lender may issue and disseminate to the public general non-confidential information describing the credit accommodation entered into pursuant to this Agreement, including the names and addresses of the Borrowers and a general description of the business of the Borrowers and may use the Borrowers’ name in advertising and other promotional material.

(b) The Agent and each Lender severally agrees to take customary and reasonable precautions and exercise due care to maintain the confidentiality of all information identified as “confidential” or “secret” by the Borrowers and provided to the Agent or such Lender by or on behalf of the Borrowers, under this Agreement, or any other Loan Document, except to the extent that such information (i) was or becomes generally available to the public other than as a result of disclosure by the Agent or such Lender, (ii) was or becomes available on a nonconfidential basis from a source other than the Borrowers, provided that such source is not bound by a confidentiality agreement with the Borrowers known to the Agent or such Lender, (iii) was in possession of a Lender prior to disclosure made by the Borrowers, or (iv) is independently developed by any Lender without the use or knowledge of any Confidential Information; provided, however, that the Agent and any Lender may disclose such information (1) at the request or pursuant to any requirement of any Governmental Authority to which the Agent or such Lender is subject or in connection with an examination of the Agent or such Lender by any such Governmental Authority; (2) pursuant to subpoena or other court process; (3) when required to do so in accordance with the provisions of any applicable Requirement of Law; (4) to the extent reasonably required in connection with any litigation or proceeding (including, but not limited to, any bankruptcy proceeding) to which the Agent, any Lender or their respective Affiliates may be party; (5) to the extent reasonably required in connection with the exercise of any remedy hereunder or under any other Loan Document; (6) to the Agent’s or such Lender’s independent auditors, accountants, attorneys, other professional advisors, rating agencies, insurers, insurance brokers, and providers of credit risk protection, provided that such Persons have been informed that such information is required to be kept confidential to the extent required by this Section 13.18; (7) to any prospective Participant or Assignee under any Assignment and Acceptance, actual or potential, provided that such prospective Participant or Assignee agrees to keep such information confidential to the same extent required of the Agent and the Lenders hereunder; (8) as expressly permitted under the terms of any other document or agreement regarding confidentiality to which any Borrower is party with the Agent or such Lender, and (9) to its Affiliates; provided that such Persons have been informed that such information is required to be kept confidential to the extent required by this Section 13.18. Notwithstanding anything herein to the contrary, the information subject to this Section 13.18(b) shall not include,

and the Agent, each Lender, and each employee, representative, or other agent of the Agent or any Lender may disclose to any and all persons without limitation of any kind, the “tax treatment” and “tax structure” (in each case, within the meaning of Treasury Regulation Section 1.6011-4) of the transactions contemplated hereby and all materials of any kind (including opinions or other tax analyses) that are provided to the Agent or such Lender relating to such tax treatment and tax structure.

13.19 Conflicts with Other Loan Documents. Unless otherwise expressly provided in this Agreement (or in another Loan Document by specific reference to the applicable provision contained in this Agreement), if any provision contained in this Agreement conflicts with any provision of any other Loan Document, the provision contained in this Agreement shall govern and control.

13.20 Westlake as Agent. By executing this Agreement, each of the Borrowers confirms to the other parties to this Agreement that Westlake shall (and has been duly appointed by each of the Borrowers to) act as agent for the Borrowers for all purposes of the Loan Documents, including, without limitation, taking any action or receiving any communication on behalf of such Borrower in connection with the Loan Documents. Each of the Lenders and the Agent shall be entitled to deal with any Borrower through Westlake and to rely on any instructions or other communications from Westlake on behalf of any Borrower. None of the Lenders or the Agent shall have any responsibility to any Borrower for dealing with the Borrowers as provided in this Section 13.20, and the Obligation of each of the Borrowers to the Lenders shall not be affected by any matter relating to acts or omissions of Westlake relating to the Borrowing or otherwise as agent for the Borrowers hereunder. Notwithstanding the appointment of Westlake as agent for the Borrowers hereunder, the Agent and the Lenders shall in their sole discretion be entitled to deal directly with any Borrower for all purposes of the Loan Documents.

13.21 Patriot Act Notice. The Agent and Lenders hereby notify the Borrowers that pursuant to the requirements of the Patriot Act, the Agent and Lenders are required to obtain, verify and record information that identifies each Borrower, including its legal name, address, tax ID number and other information that will allow the Agent and the Lenders to identify it in accordance with the Patriot Act. The Agent and the Lenders will also require information regarding each personal guarantor, if any, and may require information regarding the Borrowers’ management and owners, such as legal name, address, social security number and date of birth.

13.22 Restatement of Existing Credit Agreement. The parties hereto agree that: (a) the Obligations (as defined in this Agreement) represent, among other things, the restatement, renewal, amendment, extension and modification of the “Obligations” (as defined in the Existing Credit Agreement); (b) this Agreement is intended to, and does hereby, restate, renew, extend, amend, modify, supersede and replace the Existing Credit Agreement in its entirety; (c) the Notes executed pursuant to this Agreement amend, renew, extend, modify, replace, restate, substitute for and supersede in their entirety (but do not extinguish, the indebtedness arising under) the promissory notes issued pursuant to the Existing Credit Agreement, which existing promissory notes shall be returned to the Agent promptly after the Closing Date, marked “canceled and replaced,” and, thereafter, delivered by the Agent to the Borrowers; (d) the entering into and performance of their respective obligations under the Loan Documents and the transactions evidenced hereby do not constitute a novation nor shall they be deemed to have terminated, extinguished or discharged the indebtedness under the Existing Credit Agreement, all of which indebtedness shall continue under and be governed by this Agreement and the other Loan Documents, except as expressly provided otherwise herein; (e) the liens and security interests created by or pursuant to the Existing Credit Agreement, except as specifically modified by the Loan Documents, are ratified and confirmed as security for the Obligations, without novation, discharge or interruption; and (f) on the Closing Date, the Lenders shall severally purchase from each other and from any Lenders (as defined in the Existing Credit Agreement) that are not Lenders hereunder (the “Non-Continuing

Lenders”), the principal indebtedness owing to the Non-Continuing Lenders under the Existing Credit Agreement so that, after giving effect to such purchase and to any Loans made on the Closing Date, the principal indebtedness owing under this Agreement and participations in the Letters of Credit are held by the Lenders in accordance with their respective Pro Rata Share, and the Non-Continuing Lenders shall cease to be a party to the Existing Credit Agreement and shall not be parties to this Agreement. Such purchases shall have been deemed to have been automatically made hereunder without the necessity of the execution and delivery of any assignment documentation, on an as-is, where-is basis by the Non-Continuing Lenders and any Non-Continuing Lender shall be deemed to be a third party beneficiary of this Section 13.22.

13.23 Confirmations. Each Loan Party ratifies and confirms that each Obligation Guaranty, each Security Agreement, each Trademark Security Agreement, each Patent Security Agreement, and the other Loan Documents (to the extent it is a party thereto) are and remain in full force and effect in accordance with their respective terms, as amended hereby or by the Second Amended and Restated Security Agreement of even date herewith (“Amended and Restated Security Agreement”). In addition, each Loan Party acknowledges, agrees, accepts, and consents to the terms and provisions hereof and each other Loan Document as amended hereby or by the Amended and Restated Security Agreement. Except as expressly provided herein, or in the Amended and Restated Security Agreement, this Agreement does not constitute a waiver or modification of any of the terms or provisions set forth in the Loan Documents and shall not impair any right that the Agent or Lenders may now or hereafter have under or in connection with any Loan Document. Each Loan Party confirms, renews, regrants, and acknowledges all Liens and security interests set forth in the Loan Documents, except as modified by the Amended and Restated Security Agreement, continue to secure the Obligations, and that the Obligations shall continue to be guaranteed pursuant to each Obligation Guaranty. The Loan Parties acknowledge that certain of the guarantors under the Existing Credit Agreement have become Borrowers hereunder. Each such Loan Party agrees and acknowledges its joint and several liabilities and obligations as a Borrower, including, without limitation, with respect to any Obligations outstanding on the date hereof under the Existing Credit Agreement.

13.24 Electronic Execution. The words “execution,” “signed,” “signature,” and words of like import in this Agreement, any Assignment and Assumption, or in any amendment or other modification hereof (including waivers and consents) shall be deemed to include electronic signatures or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

[Remainder of Page Intentionally Blank. Signature Page Follows.]


BORROWERS AND GUARANTORS:

	WESTLAKE CHEMICAL CORPORATION, a Delaware corporation
	WESTLAKE PVC CORPORATION, a Delaware corporation
	WESTLAKE VINYLS, INC., a Delaware corporation
	WESTLAKE LONGVIEW CORPORATION, a Delaware corporation
	WESTLAKE ETHYLENE PIPELINE CORPORATION, a Delaware corporation
	WESTLAKE SUPPLY AND TRADING COMPANY, a Delaware corporation

	By:	/s/ ▇▇▇▇▇▇ ▇▇▇▇
		▇▇▇▇▇▇ ▇▇▇▇
		President of the above Borrowers and Guarantors