Hydrogenated Nitrile (HNBR) O-Rings

Hydrogenated Nitrile (HNBR) O-Rings

Temperature Range:Hydrogenated Nitrile Molecular Structure

-32°F (-36°C) to 300°F (149°C)

Hardness (Shore A) Range:

50 to 90

Also Know As:

Therban®, Tornac®, Zetpol®





Shelf Life:

15 Years


Hydrogenated Nitrile comes from adding hydrogen to the nitrile molecular chain to make it more stable. The addition of hydrogen reduces the number of carbon-carbon double bonds, making it less reactive.


In comparison with NBR, HNBR has better abrasion resistance, tear resistance, high-temperature properties and resistance to chemical attacks. It can be used in ozone applications, R134a refrigerant gas, petroleum oils and fuels, water and team (up to 300° F), silicone oils and greases, vegetable and animal fats and fluids.


Cannot be used in chlorinated hydrocarbons, polar solvents (esters and ketones), and strong acids.

Parker Hydrogenated Nitrile (HNBR) Compounds

Compound #:Recommended For:Temperature Range:Color:
KB190-50 (21705) Automotive Applications-25°F to 300/325°FBlack
N1173-70General Purpose-25°F to 300/325°FBlack
N1239-70Refrigerants-25°F to 300/325°FRed
KA157-70 (21407)General Purpose-30°F to 300/325°FBlack
KA158-70Low Temperature-40°F to 300/325°FBlack
KA174-75 (21107) 75 Duro, General Purpose-25°F to 300/325°FBlack
N1231-80RGD Resistant, Automotive Refrigerants -25°F to 300/325°FBlack
KA453-80 (21508)Low Swell, ED Resistant-25°F to 300/325°FBlack
KB162-80 (21378) High Temp. Hydraulics-25°F to 300/325°FBlack
KA183-85Low Temperature-55°F to 300/320°FBlack
KB163-90 (21379)High Temp. Hydraulics, ED Resistant-25°F to 300/325°FBlack
N4007-95Extrusion Resistant, ED Resistant-25°F to 300/325°FBlack

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