exclusion of other elastomers the fiber preferred facing may be a non asbestos fiber reinforced composite facing and having a thickness of about 0 010 to about 0 035 inch in a preferred form the facing is a kevlar beater addition sheet and a thickness of 0 020 inch kevlar is a trademark of e i dupont for polyaramid fibers other fiber elastomer facings and other facings such as graphite facings may be employed as well in the manufacture of a gasket of the present invention a layer such as a sheet or coil of plain imperforate or unperforated metallic core stock is provided it is then coated with the elastomer on at least one side with a high temperature resistant elastomeric coating following which it is perforated in any one of a variety of known ways to provide a large plurality of clinching tangs projecting from one side such as about 50 or more per square inch if facings are to be clinched to both surfaces tangs may be formed to project outwardly from both surfaces in a known manner the core surface or surfaces are coated as well as the surfaces of the clinching tangs which remain coated through the.