Buna-N rubber is also an ideal material for the CVT belt of automobile, automobile and aircraft fuel. NBR in China is mainly used in military, automobile and aviation industries, mainly in oil resistant parts such as oil tanks, and also in sealing parts, transmission belts, hoses and plastic modified materials. The consumption is increasing year by year. Almost all the existing rubber hose factories and sundries factories use NBR more or less. The second largest application area of nitrile rubber is sealing rubber products, which are widely used in aerospace devices, transformers, liquefied petroleum gas pipelines, etc.