Nitrile rubber or NBR is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. The chemical name of nitrile synthetic rubber is acrylonitrile-butadiene copolymer. It is one of the important synthetic rubber types having a high resistance to aliphatic hydrocarbon oils and fuels. There are different grades available with nitrile rubber manufacturers and suppliers. The higher the acrylonitrile (ACN) content in a grade of nitrile rubber, the higher will be the oil resistance but then the low temperature flexibility will get poorer.