-- 18.75 Cents Per Share Dividend Declared Payable September 12, 2012

HOUSTON, Aug. 20, 2012 /PRNewswire/ -- The board of directors of Westlake Chemical Corporation (NYSE: WLK) declared on Friday a dividend of 18.75 cents per share, an increase of over 150% from the 7.375 cents per share paid in the second quarter of 2012. The increased dividend will be payable on September 12, 2012, to stockholders of record on August 30, 2012.

This is the 32nd successive quarterly dividend that Westlake has declared since completing its initial public offering in August 2004.

Westlake Chemical Corporation (WLK)

Westlake Chemical Corporation is an international manufacturer and supplier of petrochemicals, polymers and building products with headquarters in Houston, Texas. The company's range of products includes: ethylene, polyethylene, styrene, propylene, caustic, VCM, PVC resin and PVC building products including PVC pipe, windows and fence. For more information, including career opportunities, visit the company's website at http://www.westlake.com.

SOURCE Westlake Chemical Corporation

Media Relations, David R. Hansen +1-713-960-9111, or Investor Relations, Steve Bender +1-713-960-9111