BE MATERIALS BASIC REQUIREMENTS   Tensile Strength, min           Durometer Hardness, ± 5 Points Mpa psi Ultimate Elognation, min. % Heat Aged, ASTM D 573, 70 h at 70 ° C Oil Immersion, ASTM D 471, No. 3 Oil, 70 h at 70 ° C Compression Set, ASTM D 395, Solid, max. %; 22 h at 70 ° C Available Suffixes Grade Numbers 40 3 435 500 40 2 40 7 1015 500 40 2             50 3 435 350 40 2 50 6 870 350 40 2 50 7 1015 400 40 2 50 10 1450 400 40 2, 3 50 14 2031 400 40 2             60 3 435 300 40 2 60 6 870 300 40 2 60 7 1015 350 40 2 60 10 1450 350 40 2, 3 60 14 2031 350 40 2             70 3 435 200 50 2 70 6 870 200 50 2 70 7 1015 200 50 2 70 10 1450 250 50 2, 3 70 14 2031 250 50 2 70 17 2466 250 50 2             80 7 1015 100 50 2 80 10 1450 100 50 2 80 14 2031 150 50 2 80 17 2466 150 50 2             90 7 1015 100 50 2 90 10 1450 100 50 2 90 14 2931 150 50 2