RING REINFORCED GRAPHITE FLANGE GASKET FOR 3″ PIPE-1/8″ THICK – CLASS 150 RING GASKETS (RAISED GASKETS) ARE USED ON FLANGES WITH A RAISED SURFACE AND DO NOT REQUIRE MECHANICAL MOUNTING. GRAPHITE HAS THE HIGHEST TEMPERATURE RESISTANCE OF OUR GASKET MATERIALS AND HAS EXCELLENT CHEMICAL RESISTANCE. REINFORCED WITH A STAINLESS STEEL INSERT FOR ADDED STABILITY. MORE COMPRESSIBLE THAN PTFE.