CR is a homopolymer of Chlorobutadiene. In contrast to other rubbers it has no particular distinguishing property, but does have a combination of good properties which gives this rubber a wide range of uses. Among these properties are good resistance to aliphatic oils at moderate temperatures and good resistance to ozone and weathering. Its chemical resistance is also good and the chlorine content of chloroprene rubber makes it difficult to ignite. It also have some strong mechanical properties such as good resistance to cracking during flexing. Its resistance to petrol is however limited.
Cure system – Metal oxide cured
Standard CRs are metal oxides and organic accelerators
General Information
ASTM D 1418 Designation: CR
ISO/DIN 1629 Designation: CR
ASTM D2000 / SAE J 200 Codes: BC, BE
Standard Color(s): Black
Hardness Range: 30 to 90 Shore A
Relative Cost: Low
Service Temperatures
Standard Low Temperature: -40°C / -40°F
Standard High Temperature: 100°C / 212°F
Special Compound Low Temperature: -55C / -67°F
Special Compound High Temperature: 125°C / 257°F
| Performs well in | Does not perform well in |
| Refrigerants | Aromatic hydrocarbons |
| Ammonia | Ketones |
| Water | Esters |
| Silicone grease and oils | Ethers |
| High aniline point mineral oil | Strong oxidizing acids |
| Chlorinated hydrocarbons |