For sealing HVAC insulation fiberglass duct work and flexible duct joint systems, tapes must meet UL 181 A/B-FX standard.
3M™ Foil Tape 3340 meets these UL standards, which include specifications for tensile, adhesion, shear holding as well mold growth resistance.
For general duct sealing and MRO repair applications, 3M™ Foil Tape 3380 is an excellent choice. This tape is UL 723 classified, which specifies burning characteristics of flame spread and smoke development. This is a standard important to the construction industry.
UL identification printed on the 3326 tape: Ensures that correct tape is used and is recognized by those who may be inspecting the installation.
Linered tapes: Easy to use; protects the integrity of the adhesive and allows user to put tape through narrow gaps.
Acrylic adhesive on 3340 and 3380 tape: Has very long life and is not readily degraded by high temperature.