Major Elastomers and Properties Type Isoprene SBR NEOPRENE BUTYL NITRILE ETHYLENE Rubbers COPOLYMERS EPDM EPM NR and IR Specific Gravity……… 1 0.9 1 1 1 1 Tensile Strength, psi Pure Gum ………. > 1000 < 500 > 3000 > 1500 > 500 < 400 < 300 Reinforced ………. > 4000 > 3000 > 3000 > 2000 > 3000 > 3000 > 3000 Practical shore A Hardness Range… 30-100 40-100 40-95 40-75 30-100 45-95 45-95 Resilience Room Temperature … E G G P F G G Hot…………………… E G G G F G G Tear Resistance……….. G-F F G G F G G Abrasion Resistance….. E G-E E F-G F G-E G-E Atmospheric Aging Resistance… P-E* P-E* E F-G F G-E G-E Oxidation Resistance…….. G G G G-E F E E Heat Resistance………….. G G G G-E G G-E G-E Low Temperature Flexibility… E G F F F G-E G-E Compression Set…………….. F-G F P(GN) F G E E G(W) Permeability………………….. F F G E E F F Flame Resistance ………….. P-G* P-G* E P P P-E* P-E* Acid Resistance Dilute ……………………. G F-G E E G E E Concentrated ………….. F F-G G E F G G Moisture Resistance ………. F-G G-E F F F E E Solvent Resistance Hydrocarbons ………….. P P G** P* F P P Oxygenated Solvents …… G G P G P G G G** Oil and Gasoline ……….. P P G P* E P P Animal and Vegetable Oils P-G P-G G E E G G Dielectric Properties …………. G-E G P G-E P G-E E
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