Chemical Ingredients Search for chemicals by a PC codes, Chemical Abstract Services (CAS) numbers, or partial names. This query yields information on pesticide chemical ingredients that meet the criteria you enter below. The PC code is OPP's unique chemical identifier. To enter multiple numbers or names, separate them with a comma. For product name or trade name, use query on prior page. Search by PC codes, CAS numbers or partial names: About NPIRS' USEPA/OPP Database Queries About NPIRS' Databases For content questions contact: NPIRS User Services Phone: (765) 494-6561 1435 Win Hentschel Blvd, Suite 207 West Lafayette, IN 47906-4154 E-mail: npirs@ceris.purdue.edu Modern kitchen with granite countertops