Common use of Amendment and General Release Clause in Contracts

Amendment and General Release. The Butadiene Sales Contract (Europe), dated as of April 1, 2010, between Dow Europe GmbH and ▇▇▇▇▇▇ Europe GmbH (the “Initial Contract”), is hereby amended and restated in its entirety and shall no longer be in force and effect. Each of the Parties hereto hereby irrevocably, unconditionally and completely releases and discharges the other Party hereto and its respective affiliates, directors, officers, employees, agents, successors and assigns from all current and future rights, claims, causes of action, liabilities and obligations arising under or relating to the Initial Contract, including, without limitation, all claims and payments due thereunder. This release shall be effective as of 11:59p.m. Eastern Daylight Time on June 16, 2010. The Parties hereto hereby agree and acknowledge that there are no payments or other obligations outstanding as of 11:59p.m. Eastern Daylight Time on June 16, 2010 pursuant to the Initial Contract. DOW EUROPE GMBH ▇▇▇▇▇▇ EUROPE GMBH BY: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ BY: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ TITLE: Authorized Representative TITLE: Authorized Representative Date Executed: June 17, 2010 Date Executed: June 17, 2010 ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇ TITLE: Authorized Representative Date Executed: June 17, 2010

Amendment and General Release. The Butadiene Benzene Sales Contract (Europe), dated as of April 1, 2010, between Dow Europe GmbH and ▇▇▇▇▇▇ Europe GmbH (the “Initial Contract”), is hereby amended and restated in its entirety and shall no longer be in force and effect. Each of the Parties hereto hereby irrevocably, unconditionally and completely releases and discharges the other Party hereto and its respective affiliates, directors, officers, employees, agents, successors and assigns from all current and future rights, claims, causes of action, liabilities and obligations arising under or relating to the Initial Contract, including, without limitation, all claims and payments due thereunder. This release shall be effective as of 11:59p.m. Eastern Daylight Time on June 16, 2010. The Parties hereto hereby agree and acknowledge that there are no payments or other obligations outstanding as of 11:59p.m. Eastern Daylight Time on June 16, 2010 pursuant to the Initial Contract. DOW EUROPE GMBH ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ TITLE: Authorized Representative TITLE: Authorized Representative Date Executed: June 17, 2010 Date Executed: June 17, 2010 ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ TITLE: Authorized Representative Date Executed: June 17, 2010

Amendment and General Release. The Butadiene Ethylene Sales Contract (Europe), dated as of April 1, 2010, between Dow Europe GmbH and ▇▇▇▇▇▇ Europe GmbH (the “Initial Contract”), is hereby amended and restated in its entirety and shall no longer be in force and effect. Each of the Parties hereto hereby irrevocably, unconditionally and completely releases and discharges the other Party hereto and its respective affiliates, directors, officers, employees, agents, successors and assigns from all current and future rights, claims, causes of action, liabilities and obligations arising under or relating to the Initial Contract, including, without limitation, all claims and payments due thereunder. This release shall be effective as of 11:59p.m1l:59p.m. Eastern Daylight Time on June 16, 2010. The Parties hereto hereby agree and acknowledge that there are no payments or other obligations outstanding as of 11:59p.m1l:59p.m. Eastern Daylight Time on June 16, 2010 pursuant to the Initial Contract. DOW EUROPE GMBH ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ TITLE: Authorized Representative TITLE: Authorized Representative Date Executed: June 17, 2010 Date Executed: June 17, 2010 ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇ TITLE: Authorized Representative Date Executed: June 17, 2010

Amendment and General Release. The Butadiene Benzene Sales Contract (Europe), dated as of April 1, 2010, between Dow Europe GmbH and ▇▇▇▇▇▇ Europe GmbH (the “Initial Contract”), is hereby amended and restated in its entirety and shall no longer be in force and effect. Each of the Parties hereto hereby irrevocably, unconditionally and completely releases and discharges the other Party hereto and its respective affiliates, directors, officers, employees, agents, successors and assigns from all current and future rights, claims, causes of action, liabilities and obligations arising under or relating to the Initial Contract, including, without limitation, all claims and payments due thereunder. This release shall be effective as of 11:59p.m. 11:59 p.m. Eastern Daylight Time on June 16, 2010. The Parties hereto hereby agree and acknowledge that there are no payments or other obligations outstanding as of 11:59p.m. 11:59 p.m. Eastern Daylight Time on June 16, 2010 pursuant to the Initial Contract. DOW EUROPE GMBH ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ TITLE: Authorized Representative TITLE: Authorized Representative Date Executed: June 17, 2010 Date Executed: June 17, 2010 ▇▇▇▇▇▇ EUROPE GMBH BY: /s/ ▇▇▇▇▇▇▇ ▇▇▇▇ NAME: ▇▇▇▇▇▇▇ ▇▇▇▇ TITLE: Authorized Representative Date Executed: June 17, 2010