EPDM - Ethylene Propylene Diene Monomer Rubber

Clwyd reference EPDM
ASTM classification EPDM
Typical applications
  • Automotive weather strip
  • Building weather strip
  • General extruded profiles
  • Heating/cooling hose
  • Diaphragms
  • Electrical cable insulation
  • Provides excellent resistance to ozone and weathering
  • Chemically inert – good resistance to chemicals
  • Particularly suited to extrusion processes, especially continuous vulcanisation
  • Good insulation properties
  • Poor tack and adhesion – can be difficult to bond
  • Not oil resistant
Available hardness range (Shore A) 25 - 95
Upper continuous service temp. 150°C
Min. temp. for sealing applications -55°C
Minimum non-brittle  temp.  -70°C
Tensile strength (up to) 23 MPa
Elongation at break (up to) 450%
Price Bracket Very low
ASTM 1 Oil None
ASTM 2 Oil None
ASTM 3 Oil None
Kerosene None
Liquid B None
Liquid 101 None
Phosphate ester Good
Ketone Excellent
Toluene None
Iso-octane None
Methanol Excellent
Acid (weak) Good
Acid (strong) Average
Base (weak) Excellent
Base (strong) Good
Hydrogen sulphide Excellent
Steam Excellent
Ozone Excellent
Radiation Excellent