NITRILE Acrylonitrile-Butadiene (NBR)

Nitrile Acrylonitrile-Butadiene (NBR) is the general term for acrylonitrile butadiene copolymer. The acrylonitrile content of nitrile sealing compounds varies considerably (18% to 50%) and influences the physical properties of the finished material. The higher the acrylonitrile content, the better the resistance to oil and fuel. At the same time, elasticity and resistance to compression set is adversely affected. In view of these opposing realities, a compromise is often drawn, and a medium acrylonitrile content selected. NBR has good mechanical properties when compared with other elastomers and high wear resistance. NBR is not resistant to weathering and ozone.

Heat resistance

  • Up to approximately 100°C (212°F) with shorter life @ 121°C (250°F)

  • Cold flexibility Down to approximately -34°C to -57°C (depending on individual compounds)

Chemical resistance

  • Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel,fuel

  • oils) vegetable and mineral oils and greases.

  • HFA, HFB and HFC hydraulic fluids

  • Dilute acids, alkali and salt solutions at low temperatures

  • Water (special compounds up to 100°C) (212°F)