HNBR is made via selective hydrogenation of the NBR butadiene groups which improves the temperature and ozone resistance considerably. HNBR is widely known for its physical strength and retention of properties after long-term exposure to heat, oil, and chemicals. HNBR has better heat resistance; oxidation resistance; tensile strength and abrasion resistance than standard nitrile (NBR). Also an excellent choice for automotive refrigerant service.

Both o-rings and gaskets can be made from Nitrile materials.

Names: Hydrogenated NitrileHNBRHSN

Compound Info

ASTM D1418 DesignationHNBR, HSN
ASTM D2000/SAE J200 Type, ClassDH
Hardness (Shore A)40-90

Thermal Properties

Standard Min Temp.-20°F (-29°C)
Max Temp.290°F (143°C)

Chemical Resistance

Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils) vegetable and mineral oils and greases
Silicone Oils
Automatic Transmission Fluid
Automotive refrigerants
HFA, HFB, and HFC fluids
Dilute acids, alkali and salt solutions at low temperatures

NOT Compatible

Fuels of high aromatic content
Aromatic hydrocarbons (benzene)
Chlorinated hydrocarbons (trichloroethylene)
Polar solvents (ketones, esters, ethers, acetones)
Strong acids
Glycol based brake fluids
Ozone, weather, and atmospheric aging

Disclaimer: These are general guidelines only. All materials should be tested in your application.