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Ethylene Propylene Diene Rubber (EPDM, EPT)

EPDM rubber is a thermoset elastomer or rubber material. It has a fairly low density and the highest heat capacity among rubber materials. The graph bars on the material properties cards below compare EPDM rubber to other rubber materials (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Thermal Properties

Glass Transition Temperature

-60 °C -76 °F

Maximum Temperature: Decomposition

290 °C 550 °F

Maximum Temperature: Mechanical

160 °C 330 °F

Specific Heat Capacity

2000 J/kg-K 0.48 BTU/lb-°F

Thermal Conductivity

0.2 W/m-K 0.12 BTU/h-ft-°F

Other Material Properties


1.0 g/cm3 63 lb/ft3

Elongation at Break

400 %

Tensile Strength: Ultimate (UTS)

13 MPa 1.9 x 103 psi

Common Calculations

Strength to Weight: Axial

3.6 points

Strength to Weight: Bending

12 points

Thermal Diffusivity

0.1 mm2/s

Followup Questions

Further Reading

Rubber Formulary, The, Peter A. Ciullo and Norman Hewitt, 1999