HIGHLY SATURATED NITRILE
| DESCRIPTION |
| Hydrogenation of nitrile rubber removes most of the residual unsaturation in the polymer, which makes highly saturated nitrile far less vulnerable to attack by heat, oxygen and ozone. In fact, because of superior oil and temperature resistance, highly saturated nitrile can occasionally be substituted for more costly fluorocarbon rubber. It is often used in automotive air conditioning systems that employ R-134a refrigerants. HNBR can be can be either sulfur or peroxide cured, depending on the degree of unsaturation achieved in the hydrogenation process, however, peroxide is predominately used due to the good heat stabiIity properties of the peroxide crosslinks. It can be compounded for both high and low temperature use. |
| COMPOSITION |
| Formed by hydrogenating the nitrile copolymer of butadiene and acrylonitrile. Medium density. |
| PHYSICAL PROPERTIES* | Excellent | Good | Fair | Poor |
| Abrasion resistance | • | |||
| Compression set | • | |||
| Elongation | • | |||
| Flame resistance | • | |||
| Gas permeability | • | |||
| Low temperature flexibility | • | |||
| Tear resistance | • | |||
| Tensile strength | • |
| CHEMICAL RESISTANCE* | Excellent | Good | Fair | Poor |
| Automatic transmission fluid | • | |||
| Automotive refrigerants | • | |||
| Oxygenated fuels | • | |||
| Ozone | • | |||
| Petroleum oils | • | |||
| Sour crude oil | • | |||
| Weather | • |
| OPERATING TEMPERATURE |
| -25 to 300 °F |
*Excellent, good, fair and poor serve as general guidelines only. Actual testing in the application environment is always recommended.
