Hydrogenated Nitrile (HNBR) is produced by saturating NBR's polymer backbone, substantially raising heat, ozone and abrasion resistance while keeping strong oil resistance. FITCO specifies HNBR for high-pressure/high-temperature hydraulics, compressor seals, and demanding pump applications beyond standard NBR's service life.
| Temperature range | -30°C to +150°C |
|---|---|
| Hardness range | 50–90 Shore A |
| Relative cost | $$$ |
| Resists | Mineral & synthetic oils, sour gas (select grades), ozone, abrasion |
| Avoid with | Aromatic solvents, chlorinated hydrocarbons, strong acids |
| Standards | AS568 / ISO 3601 / BS 4518 |
HNBR — Hydrogenated Nitrile isn't a single formulation — the grade below matters as much as the base compound once your application gets specific.
The majority of the NBR backbone's double bonds are saturated, giving a strong step up in heat and ozone resistance over standard NBR while keeping cost and processing closer to conventional nitrile.
Near-complete saturation of the polymer backbone for the best achievable heat, ozone and oxidative resistance within the HNBR family — specified for the most demanding compressor and downhole tool service.
A formulation variant qualified for sour oilfield gas exposure, where standard HNBR's resistance isn't sufficient for sustained H₂S/CO₂ contact.
Not sure which sub-grade fits your application? Send us your fluid, temperature and pressure and our engineers will confirm — send an enquiry →
Physical property data — hardness, tensile strength, elongation, compression set and temperature resistance — tested to ASTM/ISO standards for each hardness grade FITCO stocks.
Full physical property data sheet — hardness, tensile strength, elongation at break, compression set and temperature resistance.
Download Datasheet →Full physical property data sheet — hardness, tensile strength, elongation at break, compression set and temperature resistance.
Download Datasheet →Full physical property data sheet — hardness, tensile strength, elongation at break, compression set and temperature resistance.
Download Datasheet →General-purpose seal for mineral oils, fuels and hydraulic fluids.
-20°C to +200°CHigh-temperature, chemical-resistant sealing for oil & gas and process industries.
-15°C to +327°CNear-universal chemical resistance for the most demanding process seals.
Compare HNBR O-Rings against alternative compounds to confirm you have the right elastomer for your application.
O-Ring Material Selection →Select standard, cross-section and ID — get instant OD and material readout for HNBR O-Rings.
Open Size Chart →Download the physical property datasheet for this compound — hardness, tensile strength, compression set and temperature resistance.
Download PDFs →Send us your fluid, temperature and pressure — our engineers will confirm the compound.
