What Is the Best Duct Sealant?

Not all ducting sealant is the same. So finding the best duct sealant is actually specific to your needs. At I-Sells, we currently offer four varieties of ducting sealant, they are:

• Intumescent
• Silicone
• Oil-Based
• Acrylic water-based

Below, we will share a brief breakdown of each of these options, which includes their properties and ideal area of usage.

Intumescent Duct Sealant

Intumescent duct sealant is characterised by the fact that it expands when it is exposed to extreme heat. This expansion actually blocks fire and smoke from spreading through the ductwork. This is vital in limiting the spread of the fire, smoke damage, and smoke inhalation.

This type of ducting is ideal for areas in which fire containment is paramount, this can be used for ducting in places with important equipment such as switchboards or other crucial items. They are also helpful for high-rise buildings and other largely inhabited structures.

Silicone Duct Sealant

Silicone is generally the kind of sealant everyone is familiar with. This is because of its versatility. It offers a good resistance to high temperatures, is flexible and can adhere to many surfaces. It is available in solvent-free, or solvent based.

Silicone duct sealant is helpful for the general sealing of joints in low-movement ductwork. This is usable for both internal and external ducting. Though, it is not the best option for applications that are in high-pressure areas. 

Oil-Based Duct Sealant

Oil based duct sealant not only offers a strong level of adhesion, but it also offers an excellent resistance to moisture. As a result, this kind of sealant thrives when used for external ductwork.

It is ideal for sealing joints in external ductwork, or areas with a high level of humidity. Though be warned, aside from its strong odour, it can be extremely flammable during the application process. Be sure to use the correct safety equipment and have access to proper ventilation when installing with this sealant.

Acrylic Water-Based Duct Sealant

This particular sealant is similar to silicone to a degree. It offers a relatively good adhesion and flexibility for low movement joints. Additionally, they are known for being easy to use, and easy to clean up.

Acrylic water-based duct sealant is ideal for most indoor applications, but would get the best use being used for low pressure ductwork connections.

Can I seal a duct without sealant?

Yes, however, there are no options that have the longevity or the effectiveness of sealant. We will list commonly mentioned options and explain their drawbacks.

• Duct tape is a common example of what people would consider to use instead of ducting sealant. Put simply, duct tape is not ideal for this kind of application whatsoever. It is not fire rated, and is not an effective means for long-term sealing.

• Metal foil is another example of an alternative to sealant. However, this option actually fairs a lot better than duct tape. However, metal foil can still degrade over time. Especially if the environment is hot, humid, or oily.

Where can I buy ducting and sealant?

I-Sells is an established and trusted provider of ducting, sealant, ventilation solutions and much more! Simply click this link to see our range of items available. Whether you are buying it for yourself, or you are a HVAC expert, and everything in-between, we cover almost every possibility.

Struggling to figure out which option works best for you? Not to worry! Simply contact us about your enquiry, and we will try our best to help you find a solution that helps you to breathe a little more easily, literally!

Purchase duct sealant today