Thermofit wrap around duct bands
TWDB is a hot applied duct sealing tape composed of heat-shrinkable backing with a heat resistant pressure sensitive, non-drip adhesive and a closure patch. TWDB is installed using propane gas torches. The ducts are assembled and raised into position after installation. The tape is wrapped around the ducts where joined, a closure is then applied, allowing the tape to essentially form a tube or band around the joint. When heated in excess of 120°C (250°F), the tape shrinks tightly around the substrate of the joint area. During recovery, the adhesive softens and flows to form a tenacious bond with the substrate and to fill the irregularities such as the interlocking seams. The bond strength builds up during cool down and is fully retained after completion of the job. Mechanically strong, pressure tight seals are provided.