sealing washer：A sealing gasket, is a kind of mechanical, equipment, piping, as long as there is a fluid place is used to seal the spare parts, the use of internal and external, the role of sealing material. The gasket is metal or non metal plate material, the cutting, punching or cutting process made for pipeline connection sealing, between machine parts and mechanical sealing connection. According to the material can be divided into metal sealing gasket and non-metallic sealing gasket. The metal has a copper gasket, stainless steel gasket, iron gasket, aluminum gasket, etc.. Non metallic asbestos gasket, non asbestos gasket, paper gasket, rubber gasket, etc..