Nitrile rubber (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 acrylonitrile content offers better resistance to oil and fuel, however, the elasticity and resistance to compression set is adversely affected. On the other hand, lower acrylonitrile content offers better low temperature performance but decreases resistance to oil and fuel. In view of these opposing realities, a compromise is often drawn and a copolymer with a medium acrylonitrile content is 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:
Cold flexibility:
Chemical resistance:
Not compatible with: