Information about the resistance of the NBR standard seals we use

(other designs upon request)

Nitrile-Butadiene-Rubber (NBR)

Nitrile rubber (NBR) is the general designation for the polymer mixture used. The acrylic nitrile portion varies for technical products from 18 to 50 % and effects the elastomer properties significantly.
The oil and fuel resistance improves with high acrylic-nitrile-contents, while simultaneously reducing the flexibility in cold temperatures, the elasticity, and the deterioration of the permanent set. NBR has good mechanical properties and a higher resistance to abrasion compared to other elastomers.

Chemical resistance:

  • aliphatic hydrocarbon (propane, butane, gasoline, mineral oils, and fats, diesel fuel, heating oil)
  • plant and animal fats and oils
  • many diluted acids, bases, and saline solutions at low temperatures
  • water

Not resistant to:

  • fuels with a high aromatic contents (high-test gasoline)
  • aromatic hydrocarbon (benzene)
  • chlorinated hydrocarbons (trichlorethylene)
  • polar solvents (ketone, acetone, ethyl acetate)
  • strong acids
  • brake fluid on glycol basis
  • ozone, effects of the weather, aging