Dupont's trade name for fluoroelastomers made from tetrafluoroethylene, perfluorovinylmethyl ether, and a small percentage of crosslinkable monomer. These elastomers combine the rubbery properties of Viton with the thermal stability, chemical resistance, and electrical characteristics of tetrafluoroethylene resin. (Handbook of plastics, elastomers and composites. 4th edn. Harper CA (ed). McGraw-Hill, New York, 2002; Ash M, Ash I (1982–1983) Encyclopedia of plastics polymers, and resins, vols I–III. Chemical Publishing, New York).