August 18, 2008

Westlake Chemical Declares Increased Quarterly Dividend of 5.25 Cents Per Share

HOUSTON, Aug. 18 /PRNewswire-FirstCall/ -- The board of directors of Westlake Chemical Corporation declared on Friday a dividend of 5.25 cents per share, payable on September 12, 2008, to stockholders of record on August 28, 2008. This represents an increase of 1/4 cent per share, or 5%, over the 5 cents per share that the company has previously paid.

This is the 16th successive quarterly dividend that Westlake has declared since completing its initial public offering in August 2004.

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

Westlake Chemical Corporation

CONTACT: Media Relations, David R. Hansen, or Investor Relations, SteveBender, both of Westlake Chemical Corporation, +1-713-960-9111

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