Spiral wound gasket filler material is a kind of unique tape, made of 100% virgin PTFE, a much tighter sealing filler than any other material. It can improve your spiral wound gasket. Temperature Range -268~316 Pressure (kgf/cm2)Fluid sealing200 Gas sealing 140 Width Range 5.6mm,7.0mm,9.0mm Thickness Range 0.5mm,0.6mm,0.7mm Density(g/cm3) 0.8 Suitable medium : most chemicals except molten alkali metals and elemental fluorine