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. Available container sizes range from 11 oz. caulking tubes to 1 and 5 gallons pails.

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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.
A small pamphlet that lists all major brands and products that Carlisle HVAC carries.
As a versatile, all-purpose duct sealant for use on all types of metal duct, fiberglass duct board, duct fabric and flex duct, CCWI-181 incorporates a built-in polyester reinforcement for exceptional strength as well as UV inhibitors for outdoor use.
The Product Line Card lists all major brands and products that Carlisle HVAC carries.
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