How to Choose the Best Duct Mastic Sealant for HVAC Systems?

Ensuring that ductwork is completely sealed and leak-free during installation is crucial. Choosing the right duct sealant ensures optimal performance and extends the lifespan of your HVAC system. If you are looking for a reliable sealant for your HVAC ventilation system, we can provide a matching ventilation HVAC duct sealing solution based on the type of duct joints and project requirements.

Common Metal HVAC Duct Joint Types for Sealing

In ductwork and sheet metal fabrication, clean, smooth, and completely filled joints are essential to prevent air leaks. Different types of joints have different characteristics that you need to consider.

1.Longitudinal Seams

These are long, thin seams found on long sections of ductwork and are the most common locations for continuous air leaks. Therefore, the sealant needs to remain flexible yet strong enough after curing.

2.Transverse Seams

These situations usually occur where pipes connect to other components. These seams are wider and have a flatter surface, but gaps can easily form due to installation errors. They usually require 3-5 inches of sealant to completely cover them, and a brush is the best tool for applying sealant to these seams.

3.Flange Sealing

Flange connections are one of the most common connection methods in metal ductwork, suitable for medium to large duct systems. However, the seams are usually long, and high airtightness is required.

How to Choose the Right Duct Mastic Sealant

1. Flexibility

Metal duct sealant should withstand thermal expansion and contraction of the ductwork and daily vibrations after curing, maintaining airtightness and preventing cracking.

2. Low Odor

For indoor use, the safety of the sealant must be considered. Water-based acrylic is the most suitable sealant, with a water-based formula, low volatile organic compound (VOC) content, and no odor.

3. Curing Time

This will affect the project timeline.

Duct Mastic Sealant Solutions for Metal HVAC Duct Systems

TA102 Duct Sealant is a gray, water-based duct sealant suitable for medium to high-pressure duct systems. TA102 is high performance product with permanent flexibility, excellent water resistance, and superior sealing strength.

• Low volatile organic compound (VOC) content and odorless
• Excellent workability
• Non-corrosive to metals
• Resistant to segregation
• High solid content
• Низкая усадка

Need help choosing the most suitable sealant for your next project? Contact Tengyu, and we will provide you with professional advice on sealant selection.