Polytetrafluoroethylene (PTFE) (Teflon)

The oldest member of the Fluorocarbon family of plastics. Polytetrafluoroethylene (PTFE) was developed by Dr. R. J. Plunkett in 1938 and marketed as Teflon. It is made by polymerizing tetrafluoroethylene. PTFE is characterized by its extreme inertness to chemicals, very high thermal stability, low coefficient of friction, and ability to resist adhesion to almost any material, a property developed early on by DuPont in the creation of Teflon cookware. Its high melt viscosity makes it difficult to mold by extrusion or injection molding. PTFE is often used as coating, or molded using the sinter molding process, in which plastic particles are welded together at temperatures just below the melting point.
 
See also Fluorocarbons.
 
Source:
Whittington’s Dictionary of Plastics, 2nd ed., 255.