Polytetrafluoroethylene is resistant to practically all kinds of industrial chemicals. It is serviceable between -260°C and 260°C. PTFE is an ideal material for non-lubricated bearings owing to its extremely low coefficient of friction and free of stick-slip. Certain types are excellent in electrical insulation. PTFE is used either virgin or filled with glass fibre, carbon, graphite, bronze or molybdenum sulphide depending on the application.