The internationally patented geometry of the upper outer and inner cogging encapsulates completely the graphite or PTFE lining. The cog geometry for a narrow raised face has been calculated in such a way that even when screws of a low quality are used an ideal compression of the graphite and a double metallic sealing can be realised. Therefore, the Jungtec JP encapsulated flat profile gaskets combine the advantages of metal and composite material gaskets in an ideal way.