Commonly referred to as C8, ammonium perfluorooctanoate and its derivative salts are used by the EI du Pont de Nemours and Company chemical company to aid in the production of non-stick and protective fluoropolymers such as TEFLON™, Scotchguard™, and Gore-Tex™.  Manufactured by 3M® and sold exclusively to DuPont until 2000, 3M no longer manufactures C8, but DuPont now manufactures and uses it..