Koppers Holdings Inc. produces and sells carbon compounds and commercial wood treatment products and services to aluminum, railroad, specialty chemical, utility, concrete, and steel industries. It operates in two segments, Carbon Materials & Chemicals and Railroad & Utility Products. The Carbon Materials & Chemicals segment manufactures carbon pitch, a raw material used in the production of aluminum and steel; naphthalene for use in the production of phthalic anhydride and as a surfactant in the production of concrete; phthalic anhydride that is used in the production of plasticizers, polyester resins, and alkyd paints; and creosote and carbon black feedstock used in the treatment of wood or as a feedstock in the production of carbon black. This segment also sells refined tars, benzole, and specialty chemicals. The Railroad & Utility Products segment sells treated and untreated wood products and rail joint bars, as well as offers services primarily to the railroad and public utility markets. It provides pilings used in the industrial foundations, beach housing, docks, and piers; utility products, including transmission and distribution poles for electric and telephone utilities, and as well as procures and treats railroad products comprising concrete crossties, switch ties, and various types of lumber used for railroad bridges and crossings. Koppers Holdings Inc. operates in the United States, Australia, China, the United Kingdom, the Netherlands, and Denmark. The company, formerly known as KI Holdings Inc., is headquartered in Pittsburgh, Pennsylvania.