Westlake Chemical Corporation engages in the manufacture and marketing of basic chemicals, vinyls, polymers, and fabricated products. It operates in two segments, Olefins and Vinyls. The Olefins segment manufactures and markets ethylene, polyethylene, styrene monomer, and various ethylene co-products, such as propylene, crude butadiene, and hydrogen. The Vinyls segment manufactures and markets polyvinyl chloride, vinyl chloride monomer, chlorine, caustic soda, and ethylene. This segment also manufactures and sells products fabricated from polyvinyl chloride, which comprise pipes, window and door profiles, and fences. The companys products are used in consumer and industrial markets, including flexible and rigid packaging, automotive products, coatings, and residential and commercial construction, as well as in other durable and non-durable goods. It serves chemical processors, plastics fabricators, construction contractors, municipalities, and supply warehouses primarily in the United States, Canada, and Singapore. The company was founded in 1985 and is headquartered in Houston, Texas.