NBR – Nitrile Rubber

Acrylonitrile Butadiene Rubber (NBR), usually shortened to Nitrile, was developed in 1941 as the first oil resistant rubber. Grades with high acrylonitrile content have better oil resistance whereas low acrylonitrile content gives better low temperature flexibility and resilience.

  • Nitrile has moderate physical properties but good abrasion resistance. Gas permeability is low.
  • Ozone resistance and electrical properties are poor.
  • Flame resistance is poor and it is not suitable for use with use with polar solvents (e.g. MEK).
  • Certain grades can be compounded with PVC to improve ageing, flame, petrol and ozone resistance.
  • Carboxylated grades of Nitrile (XNBR) have improved physical properties and higher temperature resistance.
  • Potable water (WRAS) compounds are available as well as mixes suitable for use in the food and pharmaceutical industries.
  • Typical applications include accumulator bladders, diaphragms, gaskets, hose, liners, O-rings and seals.
  • Typical working temperature range: -25°C to +100°C. Low acrylonitrile materials good down to -50°C & peroxide cured materials up to +150°C.