Semi-metallic gaskets are material combination gaskets that predominantly belong to the category of flat gaskets. Flat gaskets, in turn, mainly belong to the static gasket category and are usually installed in apparatus or pipeline construction as a sealing element between two flanges. Semi-metallic gaskets often consist of a punched or cut metallic ring covered with a soft material such as fiber composites, graphite, PTFE or elastomers. They are used in all common standard flanges such as groove/spring flanges, forward/backward flanges or flanges with a smooth sealing strip. Special shapes and designs are possible.