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.

3M 14725, Foam and Fabric Spray Adhesive 24, Orange, 16 fl oz Can (Net Wt 13.8 oz), 7100179450, 12/Case
3M 49711, Particulate Respirator 8210V, N95, 7000002462, 80 EA/Case
3M 33780, 641WY 1/4" X 24", 400 Mesh Diamond Cloth Belt, 7010534915
3M 01328, PSA Cloth Disc 348D, P180 X-weight, 3 in x NH, Die 300V, 7000045068
3M 05777, Hookit Soft Interface Pad, 6 x 1/2 x 3/4 inch, 7000028239
3M 20913, PSA Cloth Disc 348D, 36 X-weight, 2 in x NH, Die 200P, 7000118919
3M 11411, Roloc Disc 361F, 50 YF-weight, TR, 1 in, Die R100N, 7000045095
ACS CX1250 Diamond Belt, 1/2" X 24" 125u
Dynabrade 94825 - 1/2" ID, 5' Long Air Hose Assembly, Female/ Male Fitting Ends Included
Dynabrade 94535 Muffler Assembly
Dynabrade 78862 Crimped Wire Radial Wheel Brush 2-1/2" Dia. x .008 x 9/16" Steel
Dynabrade 78421 7" Dia., Medium, Hook and Loop, DynaBrite NWN Surface Conditioning Disc, 25/pack
Dynabrade 78417 6" Dia., Coarse, Hook and Loop, DynaBrite NWN Surface Conditioning Disc, 25/pack
Dynabrade 91302 11-1/4" Dia. x 180 Grit A/O Non-Vacuum Hook-Face DynaCut Disc, 10/Box
Dynabrade 95724 Sanding Creme 1qt
Dynabrade 53812 .7 hp Straight-Line Die Grinder, Steel Housing, Rear Exhaust, 20,000 RPM, 1/4" Collet
Dynabrade 52290 .7 hp 7 Degree Offset Die Grinder, Front Exhaust, Short Shank, 20,000 RPM, 1/4" Collet
Dynabrade 64672 Replacement Class I Non-Flammable Panel Filter Cartridge
Dynabrade 94775 2" W x 72" L 60 Grit A/Z DynaCut Belt, 10/pack
Dynabrade 51810 .1 hp Straight-Line Pencil Grinder, Rear Exhaust, 1000,000 RPM, 1/8" Collet
Dynabrade 11202 Contact Arm Ass'y, 5/8" Dia. x 1/8" W, Rubber Wheel, with 1/4" W Platen
Dynabrade 57053 Speed Regulator
Dynabrade 64404 36" W x 60" L (914 mm W x 1,524 mm L) Metal Capture Downdraft Table, 230 V (AC), Side Exhaust
Dynabrade 11051 Contact Wheel Ass'y, 1/4" Dia. x 3/8" W, Flat Face, Steel
Dynabrade 57737 Overskirt Shroud for Orbital Sander
Dynabrade 48325 .4 hp Straight-Line Die Grinder, Rear Exhaust, 25,000 RPM, 1/4" Collet
Dynabrade 11477 Dynabelter Abrasive Belt Tool, Heavy-Duty
Dynabrade X31V - 3" Dia. Cen-Vacuum Dynorbital® Mini Extreme Random Orbital Sander
Dynabrade 52257 .7 hp Straight-Line Die Grinder, Front Exhaust, 18,000 RPM, 1/4" Collet
Dynabrade 54730 3" (76 mm) Dia. Right Angle Type 1 Cut-Off Tool, Rear Exhaust, .7 HP, 18,000 RPM, 3/8"-24 Spindle
Dynabrade 59480 Drop-In Motor
Dynabrade 78835 Crimped Wire End Brush 1" Dia. x .006 x 1" Stainless Steel
Dynabrade 14000 Dynafile Abrasive Belt Tool
Dynabrade 78600 3/8" Dia. x 2" W x 1/8" Center Hole, 120 Grit, 100/pack
Dynabrade 82467 5" Dia. x 100 Grit, A/O, Vacuum PSA Filmbac DynaCut Disc, 100/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 30330 2-1/4" W Rotor Peen Hub
Dynabrade 63988 - 3" 90 Dur. Contact Wheel Kit SuperFinisher
Dynabrade 92777 4" W x 50' L 40 Micron Diamond Microfinishing Film DynaCut Roll
Dynabrade 94796 1/2" W x 72" L 180 Grit A/O DynaCut Belt, 10/pack
Dynabrade 15101 Tension Arm (for Mini Dynafile II)
Dynabrade X61VHS 6" Dia. Central-Vacuum Dynorbital Extreme Random Orbital Sander with Speed Regulator
Dynabrade 48327 .4 hp Straight-Line Die Grinder, Rear Exhaust, 30,000 RPM, 1/4" Collet
Dynabrade 62449 Grounded Air Line
Dynabrade 90020 2-3/4" W x 15-1/2" L 120 Grit A/Z DynaCut Belt, 10/pack
3M 64324, Foil Tape 3340, Silver, 72 mm x 45.7 m, 3.9 mil, 7010335734 
