What is EPDM Rubber? Complete Guide
Last updated: March 2026
Quick Answer
EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber known for exceptional weather resistance, UV stability, and temperature range (-40°C to +120°C). It is the preferred material for outdoor seals, weatherstripping, roofing membranes, and automotive door seals.
EPDM Properties at a Glance
- Temperature range: -40°C to +120°C continuous
- UV/Ozone resistance: Excellent (outdoor rated)
- Water resistance: Excellent
- Oil resistance: Poor (use Nitrile instead)
- Hardness range: 40-90 Shore A
- Colour: Typically black, but available in colours
What is EPDM Used For?
EPDM rubber is used across multiple industries:
- Automotive: Door seals, window seals, weatherstripping, boot seals
- Construction: Roofing membranes, window gaskets, expansion joints
- Industrial: Conveyor belts, hoses, vibration dampening
- Marine: Hatch seals, porthole gaskets, deck fittings
- Railway: Door seals, window gaskets, floor matting
EPDM vs Other Rubbers
| Property | EPDM | Neoprene | Nitrile | Silicone |
|---|---|---|---|---|
| UV Resistance | ★★★★★ | ★★★☆☆ | ★★☆☆☆ | ★★★★★ |
| Oil Resistance | ★☆☆☆☆ | ★★★☆☆ | ★★★★★ | ★★☆☆☆ |
| Temperature Range | -40 to +120°C | -30 to +100°C | -30 to +100°C | -60 to +230°C |
| Weather Resistance | ★★★★★ | ★★★☆☆ | ★★☆☆☆ | ★★★★★ |
| Cost | Medium | Medium | Medium | High |
| Best For | Outdoor seals | Industrial | Oil contact | High temp |
Frequently Asked Questions
Is EPDM rubber food safe?
Standard EPDM is not food-safe. However, FDA-compliant EPDM grades are available for food and beverage applications. Always specify food-grade when ordering for food contact use.
How long does EPDM last outdoors?
EPDM typically lasts 20-30 years in outdoor applications. Its exceptional UV and ozone resistance means it outlasts most other rubber types in weathering conditions.
Can EPDM be used with oil?
No. EPDM swells and degrades when exposed to petroleum-based oils and fuels. Use Nitrile (NBR) rubber for oil-resistant applications.
What hardness EPDM should I use?
For seals and gaskets: 60-70 Shore A. For weatherstripping: 50-60 Shore A. For impact absorption: 40-50 Shore A. Higher durometer (70-90) suits load-bearing applications.
Is EPDM the same as rubber roofing?
EPDM is the most common material for flat rubber roofing membranes. The terms are often used interchangeably in the roofing industry, though EPDM specifically refers to the material chemistry.
Need EPDM rubber strip or sheet? Browse our EPDM range or contact us for custom requirements.