Acrylonitrile Butadiene Rubber (NBR – Nitrile)

Also known as Acrylonitrile Butadiene Rubber / BUNA N / Nitrile is a copolymer of Acrylonitrile & Butadiene in which Acrylonitrile content varies from 18% to 50%.

NBR (Nitrile) can be classified into 4 categories as below:

  • High or Ultra High Nitrile : Acrylonitrile (ACN) content between 36% to 50%
  • Medium High Nitrile : Acrylonitrile (ACN) content between 30% to 35%
  • Medium Nitrile : Acrylonitrile (ACN) content between 25% to 29%
  • Low Nitrile: Acrylonitrile (ACN) content 24% or lesser

Increasing ACN content Oil/Fuel & Heat Resistance improves considerably, however low temperature flexibility & resilience are compromised.

Medium High Nitrile (ACN Content 30 – 35%) offers good overall balance of all properties, hence is most widely used in the production of O’Rings, Seals & Other Moulded, Extruded Rubber Products.


  • Good Oil & Fuel Resistance
  • Good Resistance to Hydraulic Oils & Fluids
  • Good Resistance to Mineral & Vegetable Oils
  • Good Resistance to Grease
  • Good Resistance to Water
  • Good Resistance to Alcohol
  • Good Resistance to Aliphatic Hydrocarbons


  • Poor Aging Resistance
  • Poor resistance to Ozone, Weather & Sunlight
  • Poor resistance to High Aromatic Content Fuels
  • Poor Resistance to Glycol Base Brake Fluids
  • Poor Resistance to Chlorinated Hydrocarbons
  • Poor Resistance to Strong Acids
  • Poor Resistance to Polar Solvents