Carlisle Hardcast 304155 Duct Sealant 2 Gal White

Product Description

The CARLISLE HARDCAST 304155 is a general-purpose, water-based duct sealant formulated for sealing all common duct types in HVAC systems. It uses a synthetic latex base reinforced with built-in polyester fibers for added strength across joints and seams. UV inhibitors allow the product to hold up under outdoor exposure without breaking down prematurely. It carries a temperature rating of -20 to 200 degrees F, making it suitable for a wide range of residential and light commercial HVAC applications. HVAC technicians and sheet metal contractors reach for this sealant when a durable, code-compliant duct seal is required on both indoor and outdoor runs.

This sealant is designed for use on metal ductwork, fiberglass duct board, flexible duct, duct fabric, and flexible tubing runouts. Its white color blends cleanly on light-colored duct systems. With a drying time of 48 hours, technicians should plan work sequences to allow full cure before system startup. The 2-gallon pail format is well suited for service contractors working multiple systems on a job or maintaining a shop stock of sealant for ongoing duct sealing work.

Key Features

• Water-based synthetic latex formula with built-in polyester fiber reinforcement for joint strength
• UV inhibitors extend service life on outdoor duct installations
• Temperature rated from -20 to 200 degrees F for broad HVAC application coverage
• Low VOC content at 38 g/L supports compliance on low-emission job sites
• Compatible with metal duct, fiberglass duct board, flex duct, duct fabric, and flexible tubing runouts
• White color finish in a 2-gallon pail container for high-volume use

Compatibility

Suitable for use on all types of metal duct, fiberglass duct board, flex duct, duct fabric, and flexible tubing runouts in residential and light commercial HVAC systems.

Installation Notes

Licensed HVAC technicians and sheet metal contractors typically apply this sealant using a brush or trowel to clean, dry duct surfaces at joints and seams. Shut down and de-energize the air handling system before beginning duct sealing work. Allow a full 48-hour cure time before pressurizing the duct system. Follow applicable mechanical codes, including SMACNA standards and local jurisdiction requirements, for duct sealing methods and coverage.

Technical Specifications

• Base Type: Synthetic Latex / Water Based
• Color: White
• Temperature Rating: -20 to 200 degrees F
• VOC Content: 38 g/L
• Drying Time: 48 hours
• Container Size: 2 gallon
• Container Type: Pail
• Applicable Materials: Fiberglass Duct Board
• UPC: 63853280054

Standard Information

• Brand: CARLISLE HARDCAST
• Manufacturer Part Number: 304155