Composition: PTFE with glass microspheres. Good for moderate concentrations of acids and some caustics, hydrocarbons, solvents, water, refrigerants, cryogenics, or hydrogen peroxide. Temperature – Maximum: 500° F, Minimum: -350° F. Maximum pressure: 1200 psig. Sealability ASTM Fuel A 0.12 ml/hr (ASTM F37B). Creep relaxation: 40% (ASTM F38B). Tensile strength 2000 psi (ASTM D1708).