Elastomer Service Properties: CR
Service temperature limits, chemical resistance ratings, mechanical properties, and cure data for engineering elastomers and rubber compounds
| elastomer | grade or variant | acid resistance | astm designation | chemical resistance notes | common name | compression set pct (%) | compression set temp C | compression set time hr | cure system | density g cm3 (g/cm3) | elongation at break pct (%) | fuel resistance | gas permeability | glass transition temp C (C) | hardness range shore a | industry specifications | max continuous temp C (C) | max peak temp C (C) | max service temp C (C) | min service temp C (C) | notes | oil resistance | ozone resistance | steam resistance | tensile strength mpa (MPa) | tr10 temp C |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CR | Type_W | Good | BC (ASTM D2000) | Crystallization-resistant grade; better low-temp flexibility and dynamic performance than GN types; superior heat aging and oxidation resistance | Neoprene Type W | 25-40 | 100 | 22 | metal oxide | 1.23-1.45 | 400-800 | Fair | Medium | -45 | 40-80 | MIL-R-6855 Class 1 | 100 | 120 | 120 | -45 | Type W (MgO/ZnO cure); preferred for vibration mounts, flex connectors | Good | Excellent | Fair | 14-25 | -42 |
| CR | general | Fair | BC, BE (ASTM D2000) | Good balance of oil, weather, and flame resistance; better ozone resistance than NBR; fair fuel resistance; good abrasion and flex fatigue resistance | Neoprene (General) | 20-40 | 100 | 22 | sulfur or metal oxide | 1.23-1.50 | 100-800 | Fair | Medium | -45 | 20-95 | MIL-R-6855 Class 2, AMS 7281 | 110 | 130 | 120 | -40 | Polychloroprene; self-extinguishing; resistant to refrigerants R-12, R-22 | Good | Excellent | Fair | 3.5-21 | -35 |
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