EPDM (ethylene propylene diene monomer) is a synthetic rubber made for the outdoors: it resists sunlight, ozone, rain and temperature swings, stays flexible down to about –40 °C and works up to about +120 °C in general-purpose grades. It is extruded solid for lips, glazing and truck seals, or as closed-cell sponge for soft door and window strips. Its limit is oil – EPDM swells in mineral oil and fuel.
Solid, sponge or foam
| Form | Used for | Character |
|---|---|---|
| Solid (dense) EPDM | Firm lips, glazing wedges, truck door seals, edge trim | Hard-wearing, holds shape |
| EPDM sponge | Car door bulbs, soft gaskets | Closed-cell, compresses easily |
| EPDM foam strip | Self-adhesive door & window strips | Very soft, self-adhesive backing |
Where EPDM is the right choice
- Doors, windows and façades
- Car, truck and trailer weatherstrips
- Outdoor enclosures, solar panels
- Water and steam contact (not oil)
Where it is not
Oil, fuel and grease (use neoprene or nitrile), continuous heat above about +120 °C (use silicone), and clear or brightly coloured parts (use PVC, TPE or silicone). See the EPDM material page.
Quick questions
Is EPDM rubber UV resistant?
Yes – EPDM is one of the most UV- and ozone-resistant common rubbers, which is why it is used for outdoor seals.
Is EPDM the same as EPM?
Close relatives: EPDM includes a diene, which allows sulphur curing; EPM does not. For seals, EPDM is the normal choice.
Need a seal for this?
Send your section, gap size or a photo of the old seal – Dora replies usually within 2 hours. Custom extruded & moulded rubber parts are available from 10 m.