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.

ACS CX1250 Diamond Belt, 1/2" X 24" 20u
Dynabrade 53282 9" (180 mm) Dia. Right-Angle Grinder, 2.8 HP, 6,500 RPM, 5/8"-11 Spindle
Dynabrade 82442 6" Dia. x 60 Grit A/O Hook Non-Vacuum Film-Backed DynaCut Disc, 100/Box
Dynabrade 93907 3" Dia. Side Spoked Diamond Mounted Cut-Off Wheel
Dynabrade 90765 1-1/2" Dia. x 2" W, Medium, Non-Woven DynaBrite Band, 10/pack
Dynabrade 11888 Contact Wheel Ass'y, 4" Dia. x 5/8" W x 5/8" I.D., Scoop Face, 90 Duro Urethane
Dynabrade 11475 Dynabelter Abrasive Belt Tool, Standard Duty
Dynabrade 96543 Motor Tune-Up Kit
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 93099 7" Dia x 1/4" Center Hole, A-Medium, High Strength DynaBrite Clean-N-Finish Disc, 25/pack
Dynabrade 53181 3/8"-24 Male _ 1/2"-20 Male, 1" Length
Dynabrade 91755 DynaMesh 11" 280 Grit Hook & Loop Discs, 25 per box
Dynabrade 90273 3-1/2" W x 15-1/2" L 80 Grit A/Z DynaCut Belt, 10/pack
Dynabrade 11424 Spring
Dynabrade 48201 .4 hp Straight-Line Die Grinder, Rear Exhaust, 25,000 RPM, 1/4" Collet
Dynabrade 78644 1/2" Dia. x 1-1/2" W x 1/8" Center Hole, Z/A, 36 Grit, 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 78654 3/8" Dia. x 1" W x 1/8" Center Hole, Tapered Cartridge Rolls, A/O, 120 Grit, 100/pack
3M 97419, Aluminum Foil Tape 3380, Silver, 48 mm x 45 m, 3.25 mil, 7000049613 
