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Short profile of EPDM

EPDM rubber (ethylene propylene diene monomer (M-class) rubber),a type of synthetic rubber, is an elastomer which is characterized by a wide range of applications. The E refers to ethylene, P to propylene, D to diene and M refers to its classification in ASTM standard D-1418. The M class includes rubbers having a saturated chain of the polymethylene type. Dienes currently used in the manufacture of EPDM rubbers are dicyclopentadiene (DCPD), ethylidene norbornene (ENB), and vinyl norbornene (VNB). EPDM rubber is closely related to ethylene propylene rubber (ethylene propylene rubber is a copolymer of ethylene and propylene whereas EPDM rubber is a terpolymer of ethylene, propylene and a diene-component).

The main properties of EPDM are its outstanding heat, ozone and weather resistance. The resistance to polar substances and steam are also good. It has excellent electrical insulating properties.

Mechanical properties of EPDM

PropertyValue

Hardness, Shore A	40–90
Tensile failure stress, ultimate	25 MPa
Density	Can be compounded from 0.90 to >2.00 g/cm3

Thermal properties of EPDM

PropertyValue

Coefficient of thermal expansion, linear	160 µm/m·K
Maximum service temperature	150 °C
Minimum service temperature	−50 °C
Glass temperature	−54 °C

Drawing in our factory

car door weatherstrip with Double-side 3M adhesive