This FSK tape is a foil, skrim and kraft combined with an all weather rubber adhesive to maximize insulation integrity, used for sealing duct seams and joints. 7 MIL
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Low to High Velocity Air Duct Sealant seals thermal insulation and all air duct types including UL listed air ducts. Easily applied by brush, trowel, palm, spray or extrusion. Color is Tan. Store at temperatures between 45F and 90F. Apply at temperatures between 35F and 120F.