HVAC Sealant

The 1-gallon Hardcast CCWI-181 Duct Sealant is an industry-leading, water-based mastic designed for high-performance HVAC systems. Engineered for both indoor and outdoor environments, this versatile sealant provides a durable, flexible, and permanent bond that prevents air leakage, ensuring your heating and cooling systems operate at maximum energy efficiency.

Air leaks in ductwork can significantly reduce HVAC performance, leading to higher energy bills and inconsistent indoor temperatures. By applying a premium mastic like the Carlisle CCWI-181, contractors and HVAC professionals can easily seal seams, joints, and connections across various materials to meet strict energy codes and modern building standards.

Hardcast CCWI-181 Duct Sealant Features

Manufactured by Carlisle, this gray water-based sealant stands out due to its integrated polyester reinforcement. This formulation offers exceptional structural strength without the need for additional reinforcing tapes in most standard low-to-medium pressure applications.

• Suitable for sealing metal, fiberglass, and flexible ductwork
• Adheres perfectly to fabric ductwork and flexible tubing
• Formulated with built-in UV inhibitors for excellent outdoor weather resistance
• Water-based composition allows for easy application and simple soap-and-water cleanup
• Remains flexible after curing to withstand mechanical vibrations and thermal expansion
• 1-Gallon pail provides ample coverage for large commercial and residential projects

Industry Certifications and Safety Standards

When selecting a duct sealant, compliance with safety and environmental standards is paramount. The Hardcast CCWI-181 Duct Sealant is heavily certified to meet the demands of modern green building initiatives and rigorous commercial safety codes.

It is proudly UL Listed 181 AM/BM, ensuring it has passed severe testing for flame resistance, mold growth, and temperature extremes. Furthermore, it meets ASTM C-731 and D-2202 standards, guaranteeing its ideal viscosity and non-sagging properties during application. Environmentally conscious builders will appreciate that it is fully LEED Compliant and adheres to SCAQMD Rule 1168 for low VOC emissions. Uniquely, this mastic is also approved by the USDA, EPA, and FDA, making it safe for use in specialized environments like food processing facilities.

Application and Curing Guidelines

Before applying the Hardcast CCWI-181 Duct Sealant, ensure that all duct surfaces are completely clean, dry, and free of dust, grease, or loose debris. Use a high-quality chip brush, trowel, or appropriate extrusion equipment to apply a continuous, even coat over joints and seams, pushing the mastic firmly into the gaps.

For outdoor applications, the built-in UV inhibitors protect the mastic from sun degradation, but the sealant must be allowed to fully cure before being exposed to heavy rain, standing water, or freezing temperatures.

Stock up on this essential sealing compound for your next HVAC installation. Browse more adhesives and sealants in the Xpress Supply Installation Supplies category. For further details on duct sealing efficiency and energy savings, refer to the Energy Star guidelines for duct sealing.