Pipe Insulation Tape, Backing Material Aluminum, Overall Length 150 ft, Overall Width 4 in, Thickness 3.6 mil, Color Silver, Minimum Operating Temperature -31 Degrees F, Maximum Operating Temperature 248 Degrees F, Standards UL 723/ASTM E84, Adhesive Material Acrylic, For Location Indoor, Outdoor, For Material Type Steel, For Use On Air Duct Seams and Connections, Duct Board Joints and Seams, Laminated Fiberglass Blanket, Elongation 3.5 Percent, Flame Spread Index 25