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Uni-Mastic™ 181 Duct Sealer is a water-based product for sealing joints in all types of HVAC duct systems. It provides excellent adhesion to metal duct, fiberglass ductboard, and flexible duct. The sealer dries quickly and remains flexible after it has cured. Because Uni-Mastic 181 duct sealer is fiber reinforced, it is ideal for meeting the special requirements of retrofit applications and new construction. Uni-Mastic 181 duct sealer is UL listed. It is nonflammable, produces no harmful fumes, and can be used on indoor and outdoor duct systems. Uni-Mastic 181 duct sealer contains antimicrobial agents that remain effective after the adhesive has cured. Available in 10.5- and 29-ounce cartridges, 1-, 2-, and 5-gallon pails and 52-gallon drums.

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