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Unimers India Limited

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Comparative Properties

HERLENE EPDM

COMPARATIVE PROPERTIES OF COMMON ELASTOMERS

COMMON NAME - BASE POLYMER

NATURAL RUBBER

SBR

BUTYL

BUTADIENE

HERLENE EPDM

POLYCHOLOROPRENE RUBBER

NITRILE

Chemical Name

Polyisoprene

Styrene Butadiene

Isobutylene Isoprene

Polybutadiene

Ethylene Propylene Diene Terpolymer

Chloroprene

Acrylonitrile Butadiene
Material Designation (ASTM D-2000, SAE J200 Classification AA AA AA AA BA,CA,DA BC,BE BF,BG,BK,CH
ASTM D-1418 Designation NR SBR IIR BR EPDM CR NBR
Tensile strength (psi) Pure Gum Over 3000 Below 1000 Over 1500 Below 1000 Below 1000 Over 2000 Below 1000
Black Loaded Stocks Over 3000 Over 2000 Over 2000 Over 2500 Over 2500 Over 2000 Over 3000
Hardness Range (Durometer A) 30-90 40-90 40-75 40-80 25-95 15-95 25-95
Specific Gravity (Base Material) 0.93 0.94 0.92 0.94 0.86 1.23 0.96-1.02
Adhesion to Metals Excellent Excellent Good Excellent Good Excellent Excellent
Adhesion to Farbics Excellent Good Good Good Good Excellent Good
Tear Resistance Very Good Fair Good Good Good Good Fair
Abrasion Resistance Excellent Good to Excellent Good Excellent Good to Excellent Very Good Good
Compression set Excellent Good Fair Very Good Very Good Good Good
Resilience                       Cold             Excellent           Good                    Poor             Outsanding                      Good                                    Good                   Fair
                     Hot Excellent Good Very Good Excellent Very Good Very Good Fair
Dielectric Strength Excellent Good Good Good Oustanding Good Poor
Electrical Insulation Good to Excellent Good Good Good to Excellent Oustanding Fair to Good Poor
Impermeability to Gases Good Fair Outstanding Good Good Good Excellent
Acid Resistance                     Dilute                   Fair to Good Fair to Good Excellent Fair to Good Excellent Good Good
      Concentrated Fair to Good Fair to Good Good Fair to Good Good Fair Good
Solvent Resistance Alphatic Hydrocarbons Poor Poor Poor Poor Poor Fair to Good Excellent
Aromatic Hydrocarbons Poor Poor Poor Poor Poor Fair Good
Oxygenated (Ketones, etc) Poor Poor Good Poor Excellent Poor to Fair Poor
Lacquer Solvents Poor Poor Fair to Good Poor Fair to Good Poor Fair
Resistance to Animal Oils Poor Poor Fair Poor Fair Fair Excellent
Water Absorption Very Good Very Good Very Good Very Good Excellent Good Good
Oxidation Good Fair Excellent Good Excellent Good Good
Ozone Poor Poor Excellent Poor Oustanding Fair Poor
Sunlight Aging Poor Poor Very Good Poor Oustanding Very Good Poor
Heat Aging Fair Good Very Good Fair Excellent Good Very Good
Low Temperature Very Good Very Good Poor Very Good Excellent Good Fair to Good
Vegetable Oils Poor Poor Fair Poor Fair Good Excellent