Inventro Polymers manufactures Polytetrafluoroethylene - PTFE / Filled Grade Bellow. Inventro Polymers supplies rubber, PTFE [Teflon] and engineering plastic items. Polytetrafluoroethylene - PTFE / Filled Grade Bellow is used for mechanical seal and for expansion compensation, stoppers. Polytetrafluoroethylene - PTFE / Filled Grade Bellow is available in the size of 1" - 8" N.B. It is also supplied in composite bellow form like G.F.T + P.T.F.E + G.F.T, for mechanical seal purpose.