Westlake Announces Executive Appointments in Vinyls Segment

Houston, Texas – February 15, 2011 – Westlake Chemical Corporation (NYSE:WLK) announced today two executive appointments.  Mr. Mike Mattina has been promoted to the position of Vice President & General Manager – North American Pipe Corporation, with overall P & L responsibility for the PVC pipe business.  Mr. Mattina had been previously serving as the Vice President, Commercial for the company’s polyethylene business and has been with the company for 9 years. 

Mr. Mike Powell has been appointed Vice President & General Manager – Westech Building Products, and will assume P & L responsibility for the PVC windows, fence and related building products business. Mr. Powell had previously been the Vice President & General Manager – North American Pipe Corporation and has been with Westlake for 6 years.

Both Mr. Mattina and Mr. Powell will report to Mr. Bob Buesinger, Sr. Vice President for the Vinyls Segment. Mr. Albert Chao, President & CEO of Westlake Chemical Corporation stated in announcing these appointments,  "We are pleased to have  proven executives such as Mike Mattina and Mike Powell to help us continue to build and strengthen our building  products businesses through strong and focused leadership.”

North American Pipe Corporation
North American Pipe is the second largest manufacturer of PVC pipe by volume in North America and serves the water, sewer, irrigation, plumbing and conduit markets. See more at http://www.northamericanpipe.com/

Westech Building Products
Westech Building Products is one of the largest manufacturers of PVC fence components by volume in the United States and is a leading producer of PVC, windows, decking and door profiles. See more at http://www.westechbp.com/

Westlake Chemical Corporation
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 building products which include pipe, windows and fence. For more information visit the company's web page at http://www.westlake.com.

Contacts:  D. R. Hansen – Media Relations<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

                    Steve Bender – Investor Relations

                (Both at 713-960-9111)