By saturating the double bonds in butadiene segments Hydrogenated Nitrile is obtained. This special hydrogenation process reduce lots of double bonds in the main chains of NBR polymer. HNBR thus possess superior heat, chemical and ozone resistance as well as mechanical characteristics compared to standard Nitrile.
Cure system
HNBRs are usually peroxide cured. Sulfur curing is also possible, this improves flexible properties on dynamic systems but will reduce heat resistance and cause poorer compression set.
Applications
- Because of their excellent abrasion resistance, they are often used in automotive shaft systems.
- HNBR are usually internally lubricated, this improves installation and reduce friction in dynamic applications.
- HNBR are often found in automotive air conditioning systems where R13a refrigerant gas or new refrigerant for environment protection like R401a, R404a, R507 and R744 is used.
- HNBR can be created with only “white list” ingredients as specified in 21.CFR 177.2600 for use in applications where the elastomer will be in contact with food or beverages.
- In deeper oil wells, resistance to heat, crude oil, hydrogen sulfide, steam and explosive decompression is crucial. Special compounds of HNBR can be available for this purpose.
General Information
- ASTM D 1418 Designation: HNBR
- ISO/DIN 1629 Designation: HNBR or NBM
- ASTM D2000 / SAE J 200 Codes: CH, DF, DH
- Standard Color(s): Black, Green
- Hardness Range: 50 to 90 Shore A
- Relative Cost: High
Service Temperatures
- Standard Low Temperature: -40°C / -40°F
- Standard High Temperature: 150°C / 302°F
- Special Compound Low Temperature: -55C / -67°F
- Special Compound High Temperature: 165°C / 330°F
| Performs well in | Does not Perform well in |
| Petroleum based oils & fuels | Chlorinated hydrocarbons |
| Aliphatic hydrocarbones | Ketones |
| Vegetable oils | Ethers |
| Silicone oils & greases | Esters |
| Ethylene glycol | Strong acids |
| Dilute acids, bases & salty solutions to moderate temperatures | |
| Water & steam to 150°C (302°F) |