The metal flat gasket is made by machining the whole metal and used for the sealing of pressure vessels, towers, tanks, valve covers and other parts. Mainly aluminum flat mats, copper mats, stainless steel mats.National standard GB95 GB96 GB97 series. Specifications are inside. Gaskets from the chemical industry and the petrochemical industry may benefit better. To prevent the leakage of internal media such as pipe containers from being used in bolted flange joints, the products that have a sealing effect with the bolt flange are mostly located between the two flanges and are called gaskets; if you are from this Looking for gasket standards from the angle, most non-metallic gaskets are called flat gaskets.