Fitch – Material Specs

Properties Natural Rubber SBR or Buna S or GR-S Butyl Nitrile (Buna N) Neoprene Silicone EPDM Rubber
Material Designation (ASTM 0-2000.SAE J200) 1981 AA AA BA BF,BG,BK,CH BC,BE FE BA,CA,DA
Specific Properties High Mechanical strength & elasticity Good resistance to W~ in alkalis & WM Little gas permeability high damping behaviour Good swelling resistance in aliphatic hydrocarbons oil & grease Non Flammable, good weathering resistance Dry heat thermal resistance, good dielectric properties Very good ozone, dielectric & electrical resistance
Temperature range -40 to +80 C -40 to +80 C -30 to +140 C -30 to +120 C -30 to +120 C -60 to +200 C -40 to +140 C
Tensile strength PSI Over 3000 Over 2000 Over 2000 Over 2000 Over 3000 Below 1500 Over 2000
Hardness range (Duro ) 30-90 40-90 40-75 40-95 40-95 50-80 40-90
Tear resistance Very good Fair Good Fair Good Poor Fair
Abrasion resistance Excellent Good to excellent Good Good Excellent Poor Good to excellent
Metal adhesion Excellent Excellent Good Excellent Excellent Excellent Fair
Fabric adhesion Excellent Good Good Good Excellent Excellent Good
Dielectric strength Excellent Excellent Excellent Poor Very good Good Outstanding
Electrical insulation Good to excellent Good to excellent Good to excellent Poor Fair to Good Excellent Outstanding
Gas permeability Fairly low Fairly low Very low Low Low Fairly low Fairly low
Acid resistance Dilute Fair to Good Fair to Good Excellent Good Excellent Excellent Excellent
Acid resistance Concentrated Fair to Good Fair to Good Good Good Good Fair Good
Acid resistance
Aliphatic hydrocarbons Fair to Good Fair to Good Excellent Good Excellent Excellent Excellent
Aromatic hydrocarbons Fair to Good Fair to Good Good Good Good Fair Good
Oxygenated (ketones) Good Good Good Poor Poor to Fair Fair Excellent
Laquer solvents Poor Poor Fair to Good Fair Poor Poor Fair to Good
Resistance to
Animal & Vegetable Oils Poor to Good Poor to Good Very Good Very Good Good Good to Excellent Good to Excellent
Oil & Gasoline Poor Poor Poor Excellent Good Fair Poor
Swelling in Lubricating Oil Poor Poor Poor Very Good Good Fair Poor
Water absortion Very good Good to very good Very good Good Good Excellent Excellent
Oxidation Good Fair Excellent Good Very good Excellent Excellent
Ozone Poor Poor Excellent Fair Very good Excellent Outstanding
Sunlight aging Poor Poor Very good Poor Very good Excellent Outstanding
Heat aging Fair Fair to good Very good Good Good Outstanding Excellent
Low Temperature Very good Very good Good Fair to good Good Outstanding Excellent
Flame Poor Poor Poor Poor Good Fair to good Poor to Good

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