Soft gaskets usually belong to the category of flat gaskets and thus to static gaskets. Soft gaskets are punched or cut from various materials such as fibers, graphite or PTFE. The gaskets can be used in all common standard flanges, such as flanges with a smooth sealing strip, tongue-and-groove flanges, or forward/backward flanges. In the case of flanges with a smooth sealing face, the EN 1092-1 standard distinguishes between B1 and B2, which are characterized by different roughness depths. The standard B1 form is recommended here for soft-material gaskets, since the rough surface improves the sealing effect of soft-material gaskets. In addition to the standard gaskets, a large number of special shapes and designs are possible.