Specifically formulated EPDM compound.Available in nitrile and chloroprene and silicone compounds.Vacuum collapse rating exceeds 4" Hg. mercury.Recommended for temperatures: -60F to +300F duty.Complies with physical properties requirements of ASTM D2000 3BA715A14B13C12F17.70 5 Shore A Hardness1500 PSI Tensile, minimum.250% Elongation, minimum.Air Age, 70 Hrs. at 100 C.Durometer Change, +10, maximum.Tensile Change, -25%, maximum.Elongation Change, -25%, maximum.Comp. Set, Method B, at 70 C. 25% maximum.Ozone Resistance, D1171, Method B, Quality Retention Rating: 100%Low Temp. Brittleness, D2137, Method A. Non Brittle After 3 Minutes at -40 C.