RING FLEXIBLE GRAPHITE FLANGE GASKET FOR 2 -1/2″ PIPE-1/16″ 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.