Nitrile rubber is a light brown elastomer with a molecular weight of about 700000. Due to its strong polar CN group, it has excellent stability for aliphatic hydrocarbon oils and gasoline. With the increase of ACN content, the polarity of NBR increases, the chain flexibility decreases, the interaction between chains increases, the content of double bonds in the molecular chain decreases, and the degree of saturation increases, which also results in a series of performance changes. Its oil resistance, air tightness and wear resistance increase, while its processing and cold resistance decrease.