Heavy-duty professional duct tape with polyethylene and cloth construction for industrial maintenance, repair, and construction. Features immediate adhesion, water-resistant backing, and clean removability up to one month.
3M™ Heavy Duty Duct Tape 3939 is a professional-grade cloth and polyethylene laminated tape engineered for demanding maintenance, repair, and construction applications. Constructed with a durable polyethylene film laminated to cloth scrim and bonded with a strong rubber adhesive, this tape delivers exceptional holding power and reliability for indoor MRO and construction environments. The silver-colored backing resists water, wear, and abrasion while forming a tight, moisture-resistant seal in containment situations.
This versatile tape features immediate adhesion that holds reliably for up to one year indoors without deterioration, while remaining cleanly removable from opaque, non-glass surfaces for up to one month after application. The heavy-duty construction allows for both permanent and temporary applications, making it ideal for patching, bundling, reinforcing, sealing, splicing insulation, and securing conduit ends. Originally developed for HVAC applications, the tape has proven its versatility across automotive, electronics, furniture, general industrial, metalworking, military, and transportation sectors.
With a maximum operating temperature of 200°F (93°C) for up to 30 minutes, this cloth-reinforced tape tears cleanly by hand for convenient application without requiring cutting tools. The 24mm width and 54.8-meter length per roll, available in cases of 36 rolls, make it an economical choice for high-volume industrial operations. Tested for flame spread using UL723 and ASTM E84 standards, this tape meets rigorous performance requirements for professional industrial use.
Key Features
- High strength construction designed for heavy-duty maintenance, repair, and construction applications
- Clean removal capability that peels off opaque non-glass surfaces for up to one month
- Reliable rubber adhesive that bonds immediately and holds for up to one year indoors
- Strong polyethylene backing resists water, wear, abrasion, and curling
- Water-tight seal formation for moisture-resistant containment and protection
- Maximum conformability to irregular surfaces and tight spaces without lifting
- Cloth-reinforced design allows hand-tearing for convenient application without tools
- Versatile for holding, splicing, masking, patching, sealing, and seaming applications
- Flame spread tested to UL723 and ASTM E84 standards for safety compliance
- Operates at temperatures up to 200°F for extended performance
Technical Specifications
| Specification |
Value |
| Product Name | 3M Heavy Duty Duct Tape 3939 |
| Part Number | 3939 |
| UPC Code | 00021200855610 |
| 3M ID | 7000048814 |
| Overall Width (Metric) | 24 mm |
| Overall Width (Imperial) | 0.94 inches |
| Overall Length (Metric) | 54.8 meters |
| Overall Length (Imperial) | 59.93 yards |
| Backing Material | Polyethylene/Cloth Scrim |
| Adhesive Type | Rubber |
| Product Color | Silver |
| Total Tape Thickness (Imperial) | 8.6 mil |
| Total Tape Thickness (Metric) | 0.22 mm |
| Tape Thickness (mil) | 9.0 mil |
| Tensile Strength (Imperial) | 27 lb per 100mm |
| Tensile Strength (Metric) | 47.3 N/100mm |
| Elongation at Break | 17% |
| Core Size (Imperial) | 3 inches |
| Core Size (Metric) | 76.2 mm |
| Maximum Operating Temperature (Fahrenheit) | 200°F |
| Maximum Operating Temperature (Celsius) | 93°C |
| Temperature Duration | Up to 30 minutes |
| Indoor/Outdoor Rating | Indoor |
| Shelf Life | 12 months |
| Units per Case | 36 rolls |
| Smallest Saleable Unit | Roll |
| Adhesion Duration (Permanent) | Up to 1 year indoors |
| Removability Duration | Up to 1 month from opaque non-glass surfaces |
| Performance Level | Performance |
| Flame Spread Test | UL723, ASTM E84 certified |
| Brand | 3M |
| Application Type | Heavy-duty maintenance, repair, construction, HVAC |
| Industries | Automotive, Electronics, Furniture, General Industrial, MRO, Metalworking, Military & Government, Specialty Vehicles, Transportation, Woodworking |
| Recommended Applications | Patching, bundling, reinforcing, tabbing, taping/splicing insulation, capping pipe, securing conduit ends, marking, labeling, temporary repair, hanging poly drapes, protecting against light sandblast overspray |
| Usage | Industrial/occupational use only. Not for consumer sale or use. |
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