Manufacturers of parts with Polytetrafluororethyiene (PTFE) coatings
A PFAS containing chemical, perfluorooctanoic acid (PFOA), is used in the process of making PTFE, which is a form of Teflon. Our understanding is incomplete, but PFOA contamination in New York, New Hampshire, and Vermont appears to have been caused by a company that placed a non-stick coating on parts such as bearings and wires.