Duct and Insulation Tapes 600 Series   –  Extra premium grade; waterproof, polycoated cloth   –  Extra premium grade; waterproof, polycoated cloth; natural rubber adhesive with superior tack (silver/colors available). Used for demanding industrial uses such as HVAC duct sealing, manufactured housing, metal peaning, asbestos abatement, bottom board seaming. Meet Spec: UL 723, Flame Spread lndex-10, Smoke Development lndex-15.   –  Carolina Tape   –