The adhesive tape can adhere to even the toughest surfaces and is able to withstand many things. But it does not withstand extreme temperature changes in air ducts well. Heating cycles can cause the adhesives on the adhesive tape to break. Over time, the adhesive tape weakens and ends up falling off right away.
During World War II, before it was called duct tape, the U.S. military purchased quantities of fabric-backed rubber tape for emergency repairs on the battlefield. In the film industry, it's called adhesive tape and it's used for everything from connecting cables to securing sets. However, contractors should not use it for structural purposes, such as suspending ductwork, although this legal restriction is often met in the case of non-compliance.
Sherman and Walker also performed a baking test in which the sample joints were baked at temperatures of 140 to 187 F (60 to 75 C). In many parts of the U.S. In the US, attic temperatures can easily reach 150 degrees F. As for the near-total failure of the current generation of adhesive tapes, Walker says: “There's no reason to believe that adhesives and methods of constructing adhesive tapes can't be reformulated to work better at temperatures higher.
Meanwhile, there are products on the market that meet industry standards and also have good sealant durability. Given their other advantages, Sherman and Walker would like to see better quality adhesive tape, as well as an improved grading system. Both putty sealant and aluminum foil tape are good options for sealing air ducts. Despite the name “dust tape”, never seal air ducts with adhesive tape.
It just doesn't hold up. The ducts have a separate support and all other possible leaks are closed carefully, more hermetically than most real-world systems. Regardless of the sealant you choose for your ducts, be sure to choose a high-quality product and clean the application area first. It aims to provide better adhesion and strength compared to options such as adhesive tape, which eliminates the problems we have mentioned so far.
Most basic adhesive tapes adhere to just about anything, and this becomes a problem pretty quickly when it comes to ductwork. The aerosol sealing system developed at the EETD in the Berkeley laboratory was tested many times longer than the others. And in these cases, adhesive tape and other types of air conditioning tape will not stick to the ducts themselves, but will adhere to the outer layer of dust. Eight identical joints are tested simultaneously, a standard method for placing a smaller duct in a larger chamber using metal flanges, leaving gaps, each sealed with a different product.
Be sure to use the right product to seal leaking ducts and save your favorite adhesive to make wallets with adhesive tape. The primary purpose of sealing ducts is to reduce air leaks known to increase energy bills.