Koppers Holdings, Inc. operates as a holding company, which produces treated wood products, wood treatment chemicals and carbon compounds. It operates through the following segments: Carbon Materials & Chemicals; Railroad and Utility Products & Services; and Performance Chemicals. Read More The Carbon Materials & Chemicals segment manufactures carbon pitch naphthalene,creosote and carbon black feedstock. The Railroad and Utility Products & Services segment sells treated and untreated wood products, manufactured products and services primarily to the railroad and public utility markets. The Performance Chemicals segment sells preservatives for residential and agricultural treated lumber that includes decking and fencing. The company was incorporated on November 18, 2004 and is headquartered in Pittsburgh, PA.