Constructed of polyethylene film laminated to cloth with a rubber adhesive, this economical tape resists curling and tears off the roll cleanly for use in MRO/construction. 3M contractor grade Pro strength duct tape 3979 is economically priced to provide a medium strength, temporary solution. It is removable with little or no adhesive residue up to 3 months after application. Originally developed for heating, ventilating and air conditioning (HVAC) applications, duct tape is used today in a variety of maintenance, repair and construction settings. Our 3M contractor grade Pro strength duct tape 3979 was tested according to UL723, ASTM E84. Due to its unique design and price, it is a strong choice for general indoor, everyday duties where strength and moisture resistance are necessary. The contractor grade tape can also be used at temperatures as high as 200 deg f for up to 30 min. 3M contractor grade Pro strength duct tape 3979 comes with a classic, silver colored backing. Our sturdy cloth reinforced tape can be torn from the roll and sticks instantly, providing a wide range of convenient solutions. 3M family of rugged cloth and duct tapes adheres to most surfaces for applications ranging from bundling to moisture proofing, sealing to splicing, reinforcing to hanging poly drapes. Available in a variety of colors and strengths, they're known best for their hand tear ability, high tensile strength and conformability.