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Thursday, January 2, 2014

Thermofit Wraparound Heat Shrink Duct Bands (TWDB*)

Thermofit Wraparound Heat Shrink Duct Bands (TWDB*) 

Heat-shrinkable tape for sealing duct joints on round air conditioning
or heating systems.

 Product Description: TWDB duct joint sealing tape (band).
  • Construction: Two-layer system
  • First Layer: Copolymer adhesive.
  • Second Layer: Thick-walled, radiation-cross-linked, high density polyethylene
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.

Note: TWDB is not intended to be used in industrial environments where organic solvents, oil or chemicals are present.

Product Features/Benefits:
  • No primer required allowing for no drying time and easy application.
  • Low preheat sensitivity & proven functionality allows easy application combined with high functional performance.
  • High mechanical resistance backing; TWDB resists to vibration in high velocity systems operating
    up to 70°C (158°F).
  • Minimal inventory cost. TWDB’s cut-to-length system eliminates the need for multiple sizes.
  • Specially formulated sealant ensures a reliable protection. Provides high peel and shear values after installation.
  • No special equipment or skills required which makes installation fast and easy while keeping installation cost low.
Product Selection Guide:

Max. operating temperature: 70°C (158°F)
Compatible line coatings:  Jointing galvanized ducts
Min. preheat temperature: Remove moisture + surface oil
Recommended pipe preparation:  ST3

TWDB type products are available as a roll
Thermofit Wraparound Duct Tape Ordering Sizes Include:

A roll length of 165 ft with a sleeve width of 2 inches
A roll length of 165 ft with a sleeve width of 3 inches
A roll length of 165 ft with a sleeve width of 4 inches

• closure patches included


Install TWDB on rectangular and flat oval duct following the 
procedures for round duct with the following additional step:
Immediately after shrinking is complete, press down the still 
hot TWDB with roller or gloved hand on flat sections.

*See install guide for prior steps.

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