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.

Liquid Sealants Products

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Liquid Sealants Documents

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Flex-Grip 550 (Gray) SDS
Flex-Grip 550 is an all-purpose, fiber-free, duct sealant for use on all types of metal duct, fiberglass duct board, flex duct, and duct fabric. Distinguished by its ability to accommodate minor vibration and movement, Flex-Grip 550 stays flexible and will not crack.  Flex-Grip’s excellent coverage rates and brush-on application reduce the amount of sealant used and lower the labor cost of the installation.
Product Guide
Product Guide
Tech Tip Volume 12 - Shelf Life and Batch Code Decoding
Tech Tip Volume 12 - Shelf Life and Batch Code Decoding
Duct-Seal 321 Gray SDS
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.
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Stay Connected with Hardcast
Hardcast is a division of Carlisle Construction Materials, a wholly owned subsidiary of
Carlisle Companies (NYSE: CSL)


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Website Support: 1-866-920-7081
Product Support: 1-888-229-2199
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Get In Touch with Hardcast
USA Headquarters:
900 Hensley Lane
Wylie, Texas 75098
(877) 495-4822
Canadian Office:
2055 Hymus Boulevard
Dorval, QC H9P-1J8
(800) 544-5535

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