Professional-grade sealing tape with waterproof membrane, UV resistance, and high-tack adhesive for exterior applications and difficult-to-stick surfaces.
3M™ Sealing Tape 8777 is a premium translucent sealing tape engineered for demanding applications requiring reliable moisture and air barriers. This self-adhered tape features a proprietary film backing with high-tack acrylic adhesive on a split liner, specifically designed to seal difficult-to-stick surfaces including damp and challenging substrates. The tape delivers exceptional performance across extreme temperature ranges from -40°F to 176°F, with UV resistance lasting up to 12 months, making it ideal for exterior applications where durability and longevity are critical.
The tape's construction includes a waterproof membrane that creates an effective moisture barrier while preventing air infiltration. Its tough, thin, and conformable backing resists punctures and tears during application while conveniently fitting into corners and tight spaces. The aggressive acrylic pressure-sensitive adhesive maintains strong adhesion at both low and high application temperatures, ensuring reliable performance in variable climate conditions. This product is compatible with many building sealants and provides a resilient waterproof solution for deck joist sealing, header board sealing, and window and door opening protection against moisture intrusion.
Designed for industrial and occupational use, 3M™ Sealing Tape 8777 comes in a convenient case of 12 rolls, each measuring 3 inches wide by 75 feet long. The split release liner enables fast application with easy and accurate tape positioning, reducing installation time and labor costs. With a 24-month shelf life and proven reliability in appliance, automotive, construction, marine, and transportation industries, this sealing tape represents a trusted solution for professionals requiring superior sealing performance in harsh environments.
Key Features
- Self-adhered tape design for sealing difficult-to-stick surfaces including damp surfaces
- UV-resistant for up to 12 months with adhesive that does not melt or stain when exposed to heat
- Waterproof membrane that produces effective moisture barrier and air barrier
- Tough backing resists punctures and tears during application while remaining thin and conformable
- Aggressive acrylic adhesive maintains strong adhesion at low and high application temperatures
- Split release liner enables fast application with easy and accurate tape positioning
- Compatible with many building sealants for versatile sealing solutions
- Case of 12 rolls for convenient bulk purchasing and project management
Technical Specifications
| Specification |
Value |
| Product Number | 8777 |
| 3M ID | 7100025184 |
| UPC | 00051115690174 |
| Color | Tan |
| Overall Width (Imperial) | 3 inches |
| Overall Width (Metric) | 76.2 mm |
| Overall Length (Imperial) | 75 feet |
| Overall Length (Metric) | 22.86 meters |
| Overall Thickness (Imperial) | 9.9 mil |
| Backing Thickness (Imperial) | 5 mil |
| Backing Thickness (Metric) | 0.13 mm |
| Back Side Adhesive Thickness (Metric) | 0.13 mm |
| Adhesive Material | Acrylic |
| Backing Material | Proprietary Film |
| Primary Liner | Heavy Paper Split |
| Adhesion Strength (Imperial) | 60 oz/in |
| Adhesion Strength (Metric) | 66 N/100mm |
| Elongation | 7% |
| Minimum Operating Temperature (Fahrenheit) | -40°F |
| Maximum Operating Temperature (Fahrenheit) | 176°F |
| Maximum Operating Temperature (Celsius) | 80°C |
| Application Temperature Range | 0°F to 150°F (-18°C to 66°C) |
| UV Resistance | Up to 12 months |
| Shelf Life | 24 months from date of manufacture |
| Units per Case | 12 rolls |
| Product Form | Roll |
| Brand | 3M™ |
| Recommended Application | Exterior Side Panel Sealing |
| Industries | Appliance, Automotive, Construction, General Industrial, Marine, Metalworking, Military, Paper, Print, Transportation, Woodworking |
| Use Type | Industrial/Occupational use only |
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