Hydrogenated Nitrile (HNBR)

- Sep 01, 2017-

General Information
ASTM D2000
SAE J 200 Codes CH, DF, DH
Relative Cost High

-40°~150°C   Special Compound    -55°~165°C
-40°~302°F   Special Compound     -67°~330°F

Primary Uses

  • Oil resistant applications

  • Oil well applications

  • Fuel systems, automotive, marine, and aircraft

  • General industrial use

Performs Well in…

  • Petroleum based oils and fuels

  • Aliphatic hydrocargons

  • Vegetable oils

  • Silicone oils and greases

  • Ethylene glycol

  • Dilute acids, base and salt solutions to moderate temperatures

  • Water and steam to 150°C (300°F)

Doesn’t Perform Well in…

  • Chlorinated hydrocarbons

  • Polar solvents (ketones, ethers, esters)

  • Strong acids

Hydrogenated nitrile is a synthetic polymer that results from the hydrogenation of nitrile rubber (NBR). The hydrogenating process saturates the polymeric chain with accompanying improvements to the ozone, heat and aging resistance of the elastomer and improves overall mechanical properties. HNBR, like NBR, increasing the acrylonitrile (ACN) content increase resistance to heat and petroleum based oils and fuels, but decreases the low temperature performance. The acrylonitrile content ranges between 18% and 50%. HNBR fills the gap between NBR and FKM in many areas of applications. They are used to replace NBR whenever excessive heat is critical. They are also used to replace FKM whenever basic additives such as amine-based corrosion inhibitors are

Application Advantages

  • Excellent heat and oil resistance

  • Improved fuel and ozone resistance (approximately 5X) over Nitrile

  • Abrasion resistance


  • Like Nitrile, HNBR is not recommended for exposure to polar solvents.

  • Increased cold flow with hydrogenation

  • Decreased elasticity at low temperature with hydrogenation over standard nitrile

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