Duct and Insulation Tapes 600 Series   –  Metalized polycoated cloth   –  Metalized polycoated cloth duct; natural rubber adhesive. For HVAC use on flex duct, sheet metal, rigid duct board, air vents, insulations and fibrous filter banks and air pollution systems; variety of industrial uses. Meets Spec: UL 723, Flame Spread lndex-5, Smoke Development lndex-15.   –  Carolina Tape   –