Duct and Insulation Tapes 600 Series   –  Laminated foil/scrim/kraft (FSK)   –  Laminated foil/scrim/kraft (FSK); extremely high tack, aggressive rubber-based adhesive; removable liner. Engineered to seam and seal fiberglass duct board and duct wrap to maintain vapor barrier integrity; adheres tightly when smoothed down. Meets Specs: UL 723, Flame Spread lndex-10, Smoke Development lndex-25; ASTM E-84.   –  Carolina Tape   –