EPDM (Ethylene Propylene Diene Rubber)
Ethylene propylene diene monomer rubber — THE outdoor/weather elastomer. Saturated backbone gives outstanding ozone, UV, and weathering resistance. Excellent resistance to steam, hot water, and polar solvents. NOT resistant to oils/fuels (opposite of NBR). Good electrical insulation. ρ 0.85-1.3 (lightest common rubber). Used for automotive door/window seals, roofing membranes, radiator hoses, HVAC gaskets, and pond liners.
Chemical composition comparison (wt%)
Side-by-side: EPDM (Ethylene Propylene Diene Rubber) (COMPOSITION) (ASTM D1418) vs ASTM
| Element | EPDM (Ethylene Propylene Diene Rubber) (COMPOSITION) | ASTM | Overlap |
|---|---|---|---|
| Ethylene | 45–75% | — | — |
| Propylene | 25–55% | — | — |
| Diene (ENB/DCPD) | 2–10% | — | — |
Mechanical properties
70 Shore A Typical
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 7–21 | MPa |
| Elongation | 100–700 | % |
| hardness_shore_a | 30–90 | Shore A |
| Density | 0.85–1.3 | g/cm3 |
| continuous_service_temp | -50–150 | °C |
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