Westlake operations producing petrochemicals and plastics have earned the prestigious ISO 9001:2008 certification. ISO certification signifies that a company has an ongoing program of continual quality improvement. The ISO 9001:2008 certification indicates that Westlake's production facilities meet rigid standards and supplier requirements.

Westlake Chemical Corporation operations with ISO 9001:2008 certification include the following:

(Click on location below to view certificate)

Westlake Longview

Westlake Vinyls, Inc. and/or Westlake Chemical OpCo. LP - Calvert City

Westlake Chemical Op-Co Lake Charles

Westlake Polymers

Westlake PVC

Westlake Styrene

Westlake Geismar

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