Construction: Foil: 7Microns/Polyethylene/Tri-directional Fiberglass Scrim/Kraft: 60gsm / Vinyl: 25Micons Applications: Heat-sealing foil facing and vapor barrier for duct wrap. No need applying extra adhesive. Better corrosion resistance. Suitable for on-line lamination with insulation such as glass wool, rock wool and mineral wool by heating. A insulation facing to block radiant heat coming into house through the roof during the summer and retain indoor heat generated during the winter. Also used as a water vapor barrier in air conditioning ductworks and cold rooms. Different sizes are available.