1.1 FormThis specification covers one grade of glass-fiber-filled polytetrafluoroethylene (PTFE) in the form of molded billets.1.2 ApplicationPrimarily for parts, such as seals and back-up rings, requiring chemical inertness and superior mechanical properties upto 500 °F (260 °C).1.3 Safety - Hazardous MaterialsWhile the materials, methods, applications, and processes described or referenced in this specification may involve theuse of hazardous materials, this specification does not address the hazards which may be involved in such use. It is thesole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to takenecessary precautionary measures to ensure the health and safety of all personnel involved.