Hydrogenated Nitrile O-Rings & Gaskets | Seal & Design Inc.

Hydrogenated Nitrile (HNBR)

Hydrogenated Nitrile MaterialHNBR 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 Nitrile, HNBR, HSN

Compound Info
ASTM D1418 Designation HNBR, HSN
ASTM D2000/SAE J200 Type, Class DH
Hardness (Shore A) 40-90
Color green
Thermal Properties
Standard Min Temp. -20°F (-29°C)
Max Temp. 290°F (143°C)


Chemical Resistance
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 refridgerants
  • HFA, HFB, and HFC fluids
  • Dilute acids, alkali and salt solutions at low temperatures
Not compatible
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.