EPDM (Ethylene Propylene Diene Monomer)
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Also known as: ethylene propylene rubber · EPM · EPDM rubber
EPDM is a synthetic rubber with outstanding resistance to water, steam, ozone, and UV, operating from –50°C to +150°C — ideal for water systems, HVAC seals, and outdoor weatherstripping.
Technical Detail
EPDM is a terpolymer of ethylene, propylene, and a small amount of diene monomer (ENB or DCPD). The saturated polymer backbone gives excellent ozone and UV resistance — unlike NBR and FKM which degrade in outdoor exposure. Key properties: excellent resistance to hot water (up to 150°C), steam (160°C short-term), dilute acids and alkalis, ketones, and polar solvents; completely incompatible with petroleum oils, mineral grease, and most hydraulic fluids. Temperature range: –50°C to +150°C. Shore A hardness: 40–80 (standard O-ring 70 Shore A). Primary applications: water supply systems (WRAS-approved grades), steam gaskets, HVAC duct seals, automotive coolant O-rings, and outdoor weatherseals. Not suitable for any oil/fuel/hydrocarbon media.
Reference Standards
- ASTM D2000 BC/BE grade
- ISO 1629 EPDM
- WRAS (UK water regulations)
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