33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
Hydrogenated Nitrile Butadiene Rubber (HNBR):
Produced by the selective hydrogenation of nitrile groups. Its performance depends on the ACN content, which ranges from 18% to 50%, as well as the degree of saturation. It exhibits excellent mechanical properties. When in contact with mineral oils and greases, the applicable operating temperature ranges from -30°C to +140°C (up to +160°C for short periods). Special formulations can be used at temperatures as low as -40°C.
Due to its reliable performance, HNBR is the material of choice for demanding sealing and power transmission applications.
Automotive Industry (Largest Market):
Engine Systems: Crankshaft front/rear seals, valve stem seals, cylinder head gaskets.
Fuel Systems: Fuel injection line seals, O-rings.
Transmission Systems: Automatic transmission seals, gaskets.
Steering Systems: Power steering system seals.
Cooling Systems: Water pump seals.
Oil and Gas Industry:
Downhole packers, drilling equipment seals (resistant to H₂S, high temperature, and pressure).
Industrial Sector:
High-speed printer rollers, industrial rollers, synchronous belts (especially engine timing belts).
Seals for food processing and dishwashers (requiring clean-grade HNBR cured with peroxide systems).
Others:
Air conditioning compressor seals, washing machine bearing seals, etc.
| Characteristic | HNBR | Standard NBR | Explanation |
|---|---|---|---|
| Heat Resistance | Excellent | Fair | Continuous use temperature up to 150°C, short-term exposure up to 160-170°C—an improvement of about 40°C over NBR. |
| Ozone/Weather Resistance | Excellent | Poor | The saturated structure gives it ozone and weather aging resistance close to that of EPDM. |
| Oil/Fuel Resistance | Excellent | Excellent | Retains the excellent resistance of NBR to fuels, lubricating oils (including those with additives). |
| Chemical Resistance | Superior | Good | Stronger resistance to engine coolants, detergents, hydrogen sulfide, and other chemicals. |
| Mechanical Strength | High | Fair | High tensile strength, high tear strength, excellent abrasion resistance. |
| Low-Temperature Flexibility | Good | Very Good | Hydrogenation slightly increases the glass transition temperature (approx. -40°C to -20°C), but it still maintains good low-temperature performance. |
Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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