JIS B2220 SOH FLANGE tells you that a flange gasket is a ring made of a material that can produce plastic deformation and has a certain strength.
JIS B2220 SOH FLANGE tells you that most flange gaskets are cut from non-metal plates, or made to specified dimensions by professional factories, and their materials are asbestos rubber plates, asbestos plates, polyethylene plates, etc.; thin metal plates are also used. A metal-clad gasket made of asbestos and other non-metallic materials wrapped around a plate (white iron sheet, stainless steel).

JIS B2220 SOH FLANGE tells you that there is also a spiral wound flange gasket made of thin steel strips wound with asbestos strips. Ordinary rubber gaskets are suitable for occasions where the temperature is lower than 120°C; asbestos rubber gaskets are suitable for occasions where the temperature of water vapor is lower than 450°C, the temperature of the oil is lower than 350°C, and the pressure is lower than 5MPa. The most commonly used medium is the acid-resistant asbestos board.
JIS B2220 SOH FLANGE tells you that in high-pressure equipment and pipelines, lens-type or other-shaped metal flange gaskets made of copper, aluminum, and stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing finish of the sealing surface and the gasket is high.
The above information is the JIS B2220 SOH FLANGE manufacturer's introduction and analysis of the Use of flange gaskets, hope it helps you.