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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Tech Tip Volume 12 - Shelf Life and Batch Code Decoding
Tech Tip Volume 12 - Shelf Life and Batch Code Decoding
Product Guide
Product Guide
Multi-Purpose Silicone Sealant (Clear) SDS
Carlisle General Purpose Silicone Sealant is a premium one-component room temperature vulcanizing RTV acetoxy cure high strength silicone sealant and adhesive. When fully cured, this unique VOC compliant formula offers UV stability and tenacious adhesion to form waterproof and airtight bonds to metal, steel, tile, fiberglass, ceramic, glass, aluminum, painted surfaces, wood, plywood, marble, plus many other common substrates. This product is specifically formulated to offer all weather performance to meet today's Green Building Standards.
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)


Website & Product Support
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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