Camprofile gaskets consist of a metal core, generally of stainless steel, with concentric grooves on either side. A sealing layer is usually applied on both sides, and depending on the duty the material for this layer can be graphite, PTFE (Teflon), Mica, Novus Therm or soft alloys like aluminium or silver. The sealing material layers protect the flange surfaces from damage as well as providing an excellent seal.