EPDM (ethylene propylene diene monomer) is the saturated-rubber answer to weathering, ozone, UV, water and steam. Where NBR or NR crack and harden outdoors, EPDM keeps its elasticity year after year, and it holds a wider service temperature than either. It is the compound we specify for cooling towers, washdown areas, hot-water circuits and any coupling that lives outside - but it has little resistance to oils and fuels, so for oily duty choose NBR or Hytrel.
| Temperature range | -40 °C to +130 °C (short peaks to +150 °C) |
| Hardness | 60–90 Shore A |
| Weather, ozone & UV resistance | Excellent |
| Water, steam & chemical resistance | Very good |
| Oil & fuel resistance | Poor - specify NBR instead |
| Cost | Economical for long-life outdoor duty |
Properties are typical for the grades we use; we adjust hardness and compound for your duty.
H-profile gear coupling elastomer, sizes 6H – 12H, for robust medium and heavy drives.
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Heavy-duty HS-profile gear coupling elastomer, sizes 6HS – 12HS, for the toughest drive applications.
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Compact L-profile coupling elastomer, sizes L-50 – L-225, for light and medium drives.
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Multi-lobed spider elastomer for jaw couplings, HRC70 – HRC280, molded as exact drop-in replacements for global standard couplings.
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EPDM (ethylene propylene diene monomer) is a saturated rubber with outstanding resistance to weathering, ozone, UV, water and steam, plus a wide service temperature range. Choose EPDM for couplings that run outdoors, in cooling towers, washdown areas or hot-water circuits, and wherever NBR or NR would crack, harden or age out. EPDM has poor oil and fuel resistance - use NBR or Hytrel for oily duty.
We mold EPDM into gear coupling sleeves (H and HS profiles), jaw coupling spiders (L and HRC series) and grid or shear elements for outdoor, wet and steam service. Hardness from 60 to 90 Shore A, with the compound adjusted to the duty.
Typical EPDM compounds operate from about -40 °C to +130 °C, with short peaks to +150 °C in steam and hot-water service. That gives EPDM the widest general-service range of the rubber compounds we mold.
Send us your coupling model, drawing or sample — our engineers will confirm the correct element and quote within 24 hours.
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