Primarily used on heat exchangers or as shims. Can also be used for washers.
The gasket material ideally needs to be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging the flange facing. Flange surface finish is critical.
Common metals are Carbon Steel, Stainless Steel 304, 316L, 321, Soft Iron, Monel and Inconel. Other materials available on request. Thicknesses available from 0.05mm up.