Hydrogenated Nitrile (HNBR) O-Rings

Temperature Range:

-32°F (-36°C) to 300°F (149°C)

Hydrogenated Nitrile Molecular Structure

Hardness (Shore A) Range:

50 to 90

Also Known 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°F Black
N1173-70 General Purpose -25°F to 300/325°F Black
N1239-70 Refrigerants -25°F to 300/325°F Red
KA157-70 (21407) General Purpose -30°F to 300/325°F Black
KA158-70 Low Temperature -40°F to 300/325°F Black
KA174-75 (21107) 75 Duro, General Purpose -25°F to 300/325°F Black
N1231-80 RGD Resistant, Automotive Refrigerants -25°F to 300/325°F Black
KA453-80 (21508) Low Swell, ED Resistant -25°F to 300/325°F Black
KB162-80 (21378) High Temp. Hydraulics -25°F to 300/325°F Black
KA183-85 Low Temperature -55°F to 300/320°F Black
KB163-90 (21379) High Temp. Hydraulics, ED Resistant -25°F to 300/325°F Black
N4007-95 Extrusion Resistant, ED Resistant -25°F to 300/325°F Black