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 60209 - 9,000 lb. Jack with 1/2" Vi-Sorb Pad
Dynabrade 59463 Dynorbital-Spirit Drop-In Motors (10 Pack) with Repair Tools Included
Dynabrade 98641 Spring Pin
Dynabrade 78422 7" Dia., Very Fine, Hook and Loop, DynaBrite NWN Surface Conditioning Disc, 25/pack
Dynabrade 93593 1/2" Dia. x 3-48 Female Center Thread, 60 Grit, A/O, 3-Ply, J-DynaCut Eyelet Star, 50/pack
Dynabrade 79481 4" Dia. x 2" x 3/4" Arbor Hole, Dyna-Felt Polishing Flap Roll
Dynabrade 92044 2" Dia. x 1" W, 60 Grit, Z/A DynaCut Band, 10/pack
Dynabrade 92261 2-1/4" W x 9-3/4" L 80 Grit A/Z DynaCut Belt, 10/pack
Dynabrade 57120 5" Self-Generated Vacuum Conversion Kit
Dynabrade 54736 4" (102 mm) Dia. Extended Right Angle Type 1 Cut-Off Tool, .7 HP, 13,500 RPM, 3/8"-24 Spindle
Dynabrade 78322 3" Dia. x 1" W x 1/4" Shank, Very Fine, NWN DynaBrite Wheel, 10/pack
Dynabrade 78376 4" Dia. x 4" W x 3/4" Center Hole, 40 Grit, A/O, DynaCut Flap Wheel w/Flange
Dynabrade 61122 Cleanstream Abrasive Resistant HEPA Cartridge Filter
Dynabrade 54744 4" (102 mm) Dia. Right Angle Type 1 Cut-Off Tool, Steel Housing, .7 HP, 13,500 RPM, 3/8"-24 Spindle
Dynabrade 90225 1/4" W x 18" L 220 Grit A/O DynaCut Belt, 50/pack
Dynabrade 52221 .5 hp 7 Degree Offset Die Grinder, Rear Exhaust, Short Shank, 18,000 RPM, 1/4" Collet
Dynabrade 79199 3-1/2" W x 15-1/2" L 120 Grit DynaCut Premium Ceramic Belt, 10/pack
Dynabrade 11367 Contact Arm Ass'y, Radii 1-5/8" x 1/2"
3M 33443, Cubitron II File Belt, 36+, 1/2 in x 18 in (12.7 mm x 457.2 mm), 7100033184, 10 belts per carton, 5 cartons per case 
