FLATE RING, CARBON STEEL SPAIRAL WOUND GASKET, 304/GRAPHITE, OUTER RING: CARBON STEEL, INNER RING: 304 RTJ RING: SOFT IRON OUR MAIN PRODUCTS ARE FORGED STEEL FLANGES AND BUT WELD PIPE FITTINGS. BUT WE ALSO SUPPLY GASKET WHICH USED ON FLANGES. THE STANDARD IS ANSI B16.20, FLATE TYPE, RTJ RING OVAL SHAPE. THE MATERIAL CAN BE CARBON STEEL, STAINLESS STEEL AND SPAIRAL WOUND.