Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Chloroprene Rubber (CR / Neoprene) | Ethylene Propylene Diene Rubber (EPDM) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Oil & Fuel Resistant Elastomers | Weathering & Chemical Resistant Elastomers |
| ASTM Designation | CR | EPDM |
| ISO Designation | CR | EPDM |
| ASTM-D2000 Designation | Type BC / BE | Type BA / CA |
| Element | Chloroprene Rubber (CR / Neoprene) | Ethylene Propylene Diene Rubber (EPDM) |
|---|
| Mechanical Parameter | Chloroprene Rubber (CR / Neoprene)Standard General-Purpose Industrial Vulcanizate (Mercaptan-Modified) | Ethylene Propylene Diene Rubber (EPDM)Peroxide-Cured High-Temperature Compound |
|---|---|---|
| Compression Set (22h at 100°C) · Standard General-Purpose Industrial Vulcanizate (Mercaptan-Modified) · RANGE · 100 °CUnit: % | 15–35 % | 15–30 % |
Machinability: Cryogenically turned, ground, or die-cut with heavy steel dies; cleanly cut with CNC waterjet.
Formability / Cold Working: Milled on standard rubber processing machinery; compounded with metal oxides (zinc oxide and magnesium oxide) rather than sulfur. Extruded, calendered, and compression/injection molded.
Heat Treatment & Annealing: Cured via metallic oxide crosslinking (5 phr ZnO + 4 phr MgO) with organic accelerators (ETU, TMTD) at 150°C to 170°C. Sulfur-modified grades use sulfur bridges; mercaptan-modified grades use carbon-carbon links.
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.