Tanker Car to Be Removed Today; Rail Car Leak Safely Contained; Claims Number Provided

HOUSTON, Sept. 2 /PRNewswire-FirstCall/ -- Westlake Chemical Corporation (NYSE: WLK) announces that the tank car leak in Cincinnati has been completely and safely contained. The leak, which started on Sunday, resulted in no known injuries or property damage. Environmental authorities have determined that the emission levels did not pose a health risk to nearby residents. The tank car will be removed from the site today and transported to Westlake's facility at Lake Charles, LA., for further review and analysis.

Westlake Chemical has set up a claims process for residents and business owners who were evacuated from the area or suffered damages. People wanting to inquire about a claim should call 1-800-718-6714 and reference claim # 9850101325.

Westlake Chemical is not involved with the claims process set up by the Indiana & Ohio Railway.

"We want to express our gratitude to the fire and police departments and other members of the emergency response team," said Warren W. Wilder, vice president of olefins and styrene for Westlake. "They did a spectacular job. We'd also like to express our appreciation to the people of Cincinnati for their patience in this matter. We know this has been a serious concern to residents. We are thankful that the situation has been safely resolved."

Westlake has and will continue to provide full cooperation with city, state and federal officials in reviewing this situation.

Westlake Chemical Corporation is a manufacturer and supplier of petrochemicals, polymers and fabricated products with headquarters in Houston, Texas. The company's range of products includes: ethylene, polyethylene, styrene, propylene, caustic, VCM, PVC and PVC pipe, windows and fence. For more information, visit the company's Web site at http://www.westlakechemical.com .

               (713) 960-9111
     Contact:  David R. Hansen - Media Relations
               Ruth I. Dreessen - Investor Relations

SOURCE  Westlake Chemical Corporation
    -0-                             09/02/2005
    /CONTACT:  David R. Hansen, Media Relations, or Ruth I. Dreessen, Investor
Relations, both of Westlake Chemical Corporation, +1-713-960-9111/
    /Web site:  http://www.westlakechemical.com /

CO:  Westlake Chemical Corporation
ST:  Texas, Louisiana, Ohio

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