A Tape with Versatility
Originally developed for heating, ventilation and air conditioning (HVAC) applications, duct tape is used today in a variety of maintenance, repair and construction settings. 3M™ Heavy Duty Duct Tape 3939 is an excellent choice for general indoor application in MRO and construction. The tape was tested for flame spread using test method UL723, ASTM E84 and can be used at temperatures as high as 200°F for up to 30 minutes. The sturdy cloth-reinforced tape can be torn from the roll by hand and sticks instantly, providing a wide range of convenient solutions. This tape has a classic silver-colored backing.
Recommended Applications
- Patching
- Bundling
- Reinforcing
- Tabbing
- Taping / splicing insulation
- Capping pipe
- Securing conduit ends
- Marking
- Labeling
- Temporary repair
- Hanging poly (polyethylene drapes)
- Protecting against light sandblast overspray
Built to Stick
3M’s family of rugged cloth and duct tapes adheres to most surfaces for applications ranging from bundling to moisture proofing, sealing to splicing, reinforcing to hanging poly drapes. Available in a variety of colors and strengths, they’re known best for their hand tearability, high tensile strength and conformability.

Dynabrade 78476 2-1/2" Dia. x 3/4", 8-32 Female Center Thread, A/O, 180 Grit, 8-Ply J-DynaCut Cross Pad, 100/pack
Dynabrade 90410 1/8" W x 24" L 180 Grit A/O DynaCut Belt, 50/pack
Dynabrade 11870 Dynabelter Contact Arm Assembly, 2 Inch Dia x 2 Inch W, 70 Durometer, Standard Serration
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Dynabrade 92115 1/2" W x 12" L 220 Grit A/O DynaCut Belt, 50/pack
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Dynabrade 56323 3-7/8" x 5-5/8" Vacuum Dynabug II Disc Pad, Hook-Face, Short Nap 
