Ptfe Spiral Wound Gasket, Round, Thickness: 4 Mm

Special Spring like Metal strips are wound with an Asbestos / P.T.F.E / Grafoil Filler by a special process to assure a leak proof seal. The sealing is done by the Asbestos Filler and the metal strip provides the spring. This combination of metal and soft asbestos Filler piles compresses to its predetermined thickness under bolting pressure and thereby prevents leakage within the limit of its specified pressure and temperature. With the addition of centring devices, "Spitmaan" Spiral Wound Gaskets can be adapted for use on many types of flanges and closures. Nominal: 3/16" (4.8 mm) Actual: .175" ± .005" (4.5 mm)