Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Chloroprene Rubber (CR / Neoprene) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Oil & Fuel Resistant Elastomers | Oil & Fuel Resistant Elastomers |
| ASTM Designation | CR | NBR |
| ISO Designation | CR | NBR |
| ASTM-D2000 Designation | Type BC / BE | Type BF / BG / CH |
| Element | Chloroprene Rubber (CR / Neoprene) | Nitrile Butadiene Rubber (NBR) |
|---|
| Mechanical Parameter | Chloroprene Rubber (CR / Neoprene)Standard General-Purpose Industrial Vulcanizate (Mercaptan-Modified) | Nitrile Butadiene Rubber (NBR)Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) |
|---|---|---|
| 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 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.