This company introduces UNI-FLEX™ and UNI-MASTIC™ 181 duct sealers. UNI-FLEX is an economical, water-based sealant for use on low-, medium- and high-pressure duct systems. It is environmentally safe and contains no hazardous ingredients. The antimicrobial agents in this duct sealer remain active after it has cured. UNI-MASTIC 181 is a UL 181 A- and B-listed duct sealer. This water-based product seals joints in all types of HVAC systems. Because this duct sealer is fiber-reinforced, it is ideal for meeting the special requirements of retrofit applications and new construction. Circle No. 140