Duct and Insulation Tapes 600 Series   –  Contractor grade, waterproof   –  Contractor grade; waterproof, polycoated cloth; natural rubber adhesive. Designed for demanding uses with HVAC flex ducts, sheet metal, exhaust vents and pre-formed insulation; industrial packaging, splicing and securing; excellent stretch, conformability and easy unwind. Meets Spec: UL 723, Flame Spread lndex-5, Smoke Development lndex-25.   –  Carolina Tape   –