HNBR is a high-performance elastomer produced by selective hydrogenation of nitrile rubber (NBR). The hydrogenation saturates most of the double bonds in the polymer chain while retaining the nitrile groups for excellent oil resistance. As a result, HNBR significantly outperforms NBR in heat resistance, aging resistance, ozone resistance, mechanical strength, and abrasion resistance.

Key Features

High heat resistance – continuous service temperature -30°C to +150°C (up to +160°C for special grades)
Excellent oil resistance – retains NBR's resistance to fuels, mineral oils, and synthetic lubricants
High strength & abrasion resistance – tensile strength up to 20-30 MPa; abrasion resistance second only to polyurethane
Ozone & weather resistance – can be used outdoors or in ozone-rich environments without surface protection
Sour gas resistance (H2S, CO2) – suitable for oil & gas applications
Good compression set – high reliability for dynamic sealing

Typical Applications

Automotive: crankshaft seals, valve stem seals, timing belts, A/C seals, automatic transmission seals
Industrial hydraulics: high-temperature hydraulic seals, piston seals
Oil & gas: downhole tool seals, wellhead valves, H2S-resistant components
Others: oil-resistant rollers, oilfield equipment seals