Among the largest US petrochemical firms, Chevron Phillips Chemical produces ethylene, propylene, polyethylene, and polypropylene -- sometimes used as building blocks for the company's other products such as pipe. Chevron Phillips Chemical also produces aromatics such as benzene and styrene, specialty chemicals such as acetylene black (a form of carbon black), and mining chemicals. Chevron Phillips Chemical Company LP is CPChem’s (Chevron Phillips Chemical Company LLC) wholly-owned, primary US operating subsidiary. CPChem is 50% owned by Chevron U.S.A. Inc., an indirect wholly-owned subsidiary of Chevron Corporation, and 50% by wholly-owned subsidiaries of Phillips 66.