Intent: Polar nitrile resistance to mineral oil, diesel fuel, and hydraulic fluid versus non-polar EPDM resistance to outdoor ozone, weathering, hot water, and pressurized steam.
Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Nitrile Butadiene Rubber (NBR) | Ethylene Propylene Diene Rubber (EPDM) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Oil & Fuel Resistant Elastomers | Weathering & Chemical Resistant Elastomers |
| ASTM Designation | NBR | EPDM |
| ISO Designation | NBR | EPDM |
| ASTM-D2000 Designation | Type BF / BG / CH | Type BA / CA |
| Element | Nitrile Butadiene Rubber (NBR) | Ethylene Propylene Diene Rubber (EPDM) |
|---|
| Mechanical Parameter | Nitrile Butadiene Rubber (NBR)Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) | Ethylene Propylene Diene Rubber (EPDM)Peroxide-Cured High-Temperature Compound |
|---|---|---|
| Compression Set (22h at 100°C) · Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) · RANGE · 100 °CUnit: % | 15–30 % | 15–30 % |
Machinability: Cryogenically deflashed with polycarbonate media or liquid nitrogen tumbling; turned on CNC lathes equipped with frozen chuck fixtures.
Formability / Cold Working: Readily compounded in internal mixers with carbon black, plasticizers (phthalates, adipates), and cure packages. Formed by high-precision compression, transfer, and multi-cavity injection molding; extruded into fuel hose inner tubes.
Heat Treatment & Annealing: Vulcanized with sulfur/accelerator packages for optimal dynamic fatigue or peroxide cure packages for improved compression set and heat resistance up to 120°C.
Machinability: Cryogenically machined; waterjet cut without abrasive garnets for pure elastomer gaskets.
Formability / Cold Working: Readily compounded in internal mixers with high paraffinic oil and carbon black loading. Extruded into dense and sponge weatherstrip profiles with continuous microwave/hot-air vulcanization (HAV) lines; precision injection molded.
Heat Treatment & Annealing: Vulcanized via sulfur-accelerator systems for rapid extrusion cure or organic peroxide systems (dicumyl peroxide, DTBP) for superior compression set, heat resistance up to 150°C, and steam resistance.