SUNPASS Mica Tape Filler For Spiral Wound Gasket. Mica Tape Filler For Spiral Wound Gasket is a good quality electrical insulation material made of mica and reinforced fiberglass cloth, plastic film or other materials, with high temperature resin impregnated adhesive. Depending on the type of mica tape this can withstand a temperature of up to 1000°C for 3 hours at a supply voltage of up to 1000V. This material is non-toxic and does not give fumes at high temperatures.