Liquid Sealants

Hardcast manufactures water and solvent based liquid applied mastic/sealants for sealing metal, flexible and rigid fiberglass ductwork. The mastic/sealants are either fiber reinforced or non-reinforced and are available in white or gray. These products are listed by UL (Underwriters Laboratory) having UL-181 A-M and/or UL-181 B-M. All water based sealants are GREENGUARD Gold (UL 2818) certified. Available container sizes range from 11 oz. caulking tubes to 1 and 5 gallons pails.

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RE-500 is a high-performance, spray-applied insulation encapsulant and coating. This spray coating provides resistance to mold growth and is designed for use inside HVAC ductwork to encapsulate surfaces of lined ducts to prevent fiberglass fibers from becoming airborne. At 13 g/l this low-VOC coating is ideal for critical projects such as hospitals and schools. The semi-gloss finish provides a surface that will prevent debris accumulation that could lead to mold growth.
Duct-Seal 321 is an all-purpose industrial-grade duct sealant for all types of metal duct, fiberglass duct board, duct fabric and flex duct. It includes UV inhibitors for extended outdoor exposure and built-in fiber reinforcement for added strength. This non-toxic water-based product is solvent free and is suitable for residential use.
Tech Tip Volume 10 - Sealants and Coatings
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