EPDM is a rubber with excellent resistance to weather, sunlight, ozone, water and steam. It stays flexible from about −40 to +150 °C and is used for door and window seals, water and steam gaskets, radiator hoses, roofing and outdoor parts. It must not be used with mineral oils, fuels or grease, which make it swell.
Quick facts
- Good with
- Water, steam, weather, ozone, brake fluid, many acids and alkalis
- Not good with
- Mineral oil, grease, petrol, diesel
- Temperature
- About −40 to +150 °C
- Hardness
- About 30–90 Shore A
- Outdoor life
- Very long
- Forms
- Moulded parts, extruded profiles, sheets, sponge
Typical uses
- Door, window and panel seals (extruded profiles)
- Water pump and valve gaskets
- Steam and hot water seals
- Radiator and coolant hoses
- Roofing membranes and outdoor covers
Good to know
- Peroxide-cured EPDM handles steam and heat better than sulphur-cured
- Food and potable-water grades are available
- Never use EPDM near oil: it swells and fails
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Questions
- EPDM or NBR for a water pump seal?
- EPDM for water and coolant; NBR if the seal touches oil.
- Is EPDM safe for drinking water?
- Yes, if it is a potable-water approved compound; ask the supplier for the certificate.
- Why do EPDM seals swell?
- Usually contact with oil or grease. Use a different lubricant or switch to NBR.
The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 29 October 2026.