NBR provides excellent resistance to petroleum oils and gasoline as well as mineral and vegetable oils. However, NBR has poor resistance to the swelling action of oxygenated solvents such as acetone and ketones. It has good resistance to acids and bases except those having strong oxidizing effects. Resistance to heat aging is good—often a key advantage over natural rubber.
Higher acrylonitrile contents increase solvent resistance but decrease low-temperature flexibility. Compounding to improve low-temperature flexibility decreases oil and solvent resistance. This material does not crystallize on stretching and reinforcing materials are required to obtain high strength. With compounding, it is possible to get a fairly good balance between low creep, good resilience, low permanent set and good abrasion resistance. Tear resistance and electrical insulation properties of NBR are inferior to natural rubber. Suitable applications include:
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