 The Covestro (former Bayer MaterialScience) Baytown Industrial Park is the largest of Covestro's U.S. chemical processing sites producing a variety of petrochemical products.The Cedar Bayou plant, in operation since 1963, is Chevron Phillips Chemical's largest manufacturing site in the United States.is a newer and growing industrial district which is quickly acquiring new tenants such as Jindal Steel and Power Limited and Samson Controls.