... exchange,auto vent-pipe, hole of flange and etc Spiral wound gasket:static sealing element of pipe, valve,pump,thermal exchange ... and nonmetal tape, which are overlapped each other and wound continuously. 2) To fasten the metal tape, both ... welded.3) Types: a) R type: spiral winding only b) IR type: spiral winding with inner ring c) CG type ... strip.5): size: 1/2"-48"6): ASTM, DIN Spiral wound gasket