EPDM

Material Type:
Durometer:
Color:
Temperature Range:
Hardness (shore A):
Elongation (%):
Tensile Strength:
Cure System:
Meets Specification:

Ethylene Propylene Rubber (EPR)
70A
Black
-55°C (-67°F) to 125C (257°F)
70±5
200 (min)
1450 (min) psi (Mpa)
Sulfur
ASTM D2000 M2DA710 A26 B36 EA14 F18 G11

EPDM (ethylene propylene diene monomer) rubber is a terpolymer of ethylene, propylene, and a small amount of diene monomer, enabling sulfur vulcanization. EPDM O-rings are widely used in industries such as automotive, HVAC, braking systems, water treatment, plumbing, and food processing. They offer excellent resistance to ozone, UV, sunlight, and weathering; superior low-temperature flexibility (down to ~ -50°C); good compatibility with dilute acids, alkalis, polar solvents, steam, and hot water; and strong electrical insulation. Standard sulfur-cured EPDM provides better dynamic flexibility but tends to harden and shows poorer compression set at high temperatures. Peroxide-cured variants deliver superior heat resistance, lower compression set, and better performance in aggressive environments, though at a higher cost.