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 11214 Contact Arm Ass'y, 7/16" Dia. x 3/8" W, Rubber Wheel, with 1/2" W Platen
Dynabrade 78064 1/2" W x 30" L Medium NWN DynaBrite Belt, 10/pack
Dynabrade 11615 Contact Wheel, 1" Dia. x 1" W x 5/8" I.D., Flat Face, 80 Duro Rubber
Dynabrade 91754 DynaMesh 11" 240 Grit Hook & Loop Discs, 25 per box
Dynabrade 78657 3/8" Dia. x 1-1/2" W x 1/8" Center Hole, Tapered Cartridge Rolls, A/O, 80 Grit, 100/pack
Dynabrade 93395 4" Dia. x 1/2" Center Hole, 180 Grit, A/O,. Arbor-Mount Sanding Star, 10/pack
Dynabrade 78106 3" Dia. x 120 Grit A/Z DynaCut Locking-Type Disc, 2 Ply Cloth, 25/pack
Dynabrade 48355 .4 hp Straight-Line Die Grinder, Rear Exhaust, 35,000 RPM, 1/4" Collet
Dynabrade 91984 JH-20 3/4" Vi-Sorb Pad
Dynabrade 54742 3" (76 mm) Dia. Extended Right Angle Type 1 Cut-Off Tool, Steel Housing, .7 HP, 18,000 RPM, 3/8"-24 Spindle
Dynabrade 93689 Extension Cap
3M 33440, Cubitron II File Belt, 33440, 80+, 10 mm x 330 mm (3/8 in x 13 in), 7100033195, 10 belts per carton, 5 cartons per case 
