July 22, 2008

Second Quarter 2008 Westlake Chemical Corporation Earnings Conference Call

HOUSTON, July 22 /PRNewswire-FirstCall/ -- Westlake Chemical Corporation will release its 2008 second quarter earnings prior to the market opening on Tuesday, August 5, 2008. The company will host a conference call at 11:00 a.m. Eastern Time (10:00 a.m. Central Time) on the same day to discuss the earnings release.

To access the conference call, dial (800) 659-2056, or (617) 614-2714 for international callers, approximately 10 minutes prior to the scheduled start time and reference passcode 82398295.

The conference call will also be available via webcast at http://phx.corporateir.net/phoenix.zhtml?p=iroleventDetails&c=180248&eventID=1 903600 (Due to length of URL, please cut and paste into browser.) and the earnings release can be obtained via the company's Web page at, http://www.westlake.com/fw/main/IR_Home_Page-123.html.

This call will be available for replay beginning an hour after the call has ended, and may be accessed until 1:00 p.m. Eastern Time on August 12, 2008. The replay can be accessed by calling the following numbers: Domestic callers should dial 1-888-286-8010 and international callers may access the replay at 617-801-6888. The access code at both numbers is 52344617.

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.westlake.com/ .

   Investor Contact   Steve Bender, 713-960-9111   [email protected]    Media Contact   David Hansen, 713-960-9111   [email protected]  

Westlake Chemical Corporation

CONTACT: Investor Contact: Steve Bender, +1-713-960-9111,[email protected], Media Contact: David Hansen, +1-713-960-9111,[email protected], both of Westlake Chemical Corporation

Web site: http://www.westlake.com/