Duct and Insulation Tapes 600 Series   –  Industrial grade, waterproof   –  Industrial grade; waterproof, polycoated cloth; natural rubber adhesive (silver and colors available). For indoor/outdoor use in HVAC on flex duct and sheet metal, book binding, seat repair, packaging, bundling, color coding, sealing hatch covers and cargo doors on ships. Meets Spec: UL 723, Flame Spread lndex-5, Smoke Development Index-10.   –  Carolina Tape   –