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 21762, Stikit Cloth Disc Roll 341D, 60 X-weight, 6 in x NH, Die 600Z, 7000118780
3M 87449 Silver Depressed Center Grinding Wheel, T27 Quick Change, 9 in x 1/4 in x 5/8-11 Center Hub Thread, 7010409732, 20 per case
3M 64324, Foil Tape 3340, Silver, 72 mm x 45.7 m, 3.9 mil, 7010335734
3M 85393, Cloth Belt 777F, P120 YF-weight, 2 in x 48 in, Film-lok, L-flex, 7000118464, 50 per case
3M 77558, Cubitron II Hookit Cloth Disc 947A, 77558, 40+ to 120+, 6 in x NH, Die 600Z, 7100232737
Dynabrade 95848 Dynabrade Gear Oil
Insize SPM-1000-U, SURFACE PROFILE MEASURING MACHINE, 6940561937695
Dynabrade 11254 Contact Arm Ass'y, 4-3/4" Dia. x 1/2" W
3M Scotchkote Liquid Epoxy Coating Spray System HSS Mix Nozzle, RightAngle, 7000058900
Binks 0811-7500-4, Airless 75M Gun Assembly
3M 45702, Cubitron II Hookit Cloth Disc 947A, 120+ X-weight, 3 in x NH, Die 300V, 7100113117
3M 06506, Scotch Steel Gray Masking Paper, 06506, 6 in x 1000 ft, 6 per case, 7000045440
Dynabrade 60052 .1 hp Straight-Line Quick-Change Pencil Grinder, Rear Exhaust, 35,000 RPM, 3/32" Collet
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 
