Construction: Heat Sealing Alu Foil Facing: Foil: 18 Microns/Two-way Fiberglass Scrim: 5x5mm/Vinyl: 25gsm Application: Heat Sealing Alu Foil Facing is a premium insulation facing, suitable for on-line lamination with insulation such as glass wool, rock wool and mineral wool by heating. An foil insulation facing to block radiant heat coming into house through the roof and walls during the summer and retain indoor heat generated during the winter.heat fsk facingused as a water vapor barrier in air conditioning ductworks and cold rooms. Benefit: Our aluminum foil facing no need applying extra adhesive. Does not contain hazardous chemicals or harmful materials that cause itching or respiratory problems. A radiant barrier stops 97% of radiant heat transfer which improves the performance of the insulating material. Scrim reinforced for strength and durability. Roll Width: 1.2M, 1.25M Roll Length: Up 3000M