Compounding washer consists of with metal flake and rubber, widely used for sealing bolts, which is standard sealing parts. We mainly use oil resistant butadiene-acrylonitrile rubber as the major material for making compounding washer. Meanwhile, we can produce in accordance of customer's needs with the special or specified materials. According to the construction of production compouding washer which can sort to be model A and B. According to different state of encapsulation can be classified into half encapsulated, fully encapsulated, expose pieces for customers to select.