Premium 41 mil polyurethane protective tape with acrylic foam adhesive for aerospace surface protection against FOD, abrasion, and impact damage. Available perforated and non-perforated.
3M™ Polyurethane Protective Tape 8641 is a premium 41 mil high-impact polyurethane protective tape engineered specifically for aerospace and industrial applications. This robust protective tape features an acrylic foam adhesive and is commonly referred to as "Belly Tape" due to its widespread use on the underside of military and commercial aircraft. The tape provides exceptional protection against small foreign object damage (FOD), abrasion, erosion, scratches, and puncture damage that can compromise aircraft integrity. With a pressure-sensitive foam acrylic adhesive that bonds immediately upon contact, this tape adheres to a wide variety of substrates while maintaining consistent adhesion levels over extended periods and through temperature variations. The tape is available in both perforated and non-perforated versions, with perforated designs ideal for pressurized fuselage panels and non-perforated versions suitable for general surface protection applications.
The 3M 8641 tape is conformable to curved surfaces, making application fast and easy across complex aircraft geometries. It can be applied directly to painted surfaces or painted over after application, providing design flexibility for maintenance and repair operations. The acrylic adhesive resists yellowing during long-term exposure and maintains its protective properties in extreme environmental conditions, with operating temperatures ranging from -40°F to well above standard service conditions. This tape is qualified to numerous military and commercial aircraft specifications, ensuring compliance with stringent aerospace standards. The backing material provides excellent tensile strength of 93 lb/in and adhesion strength of 75.1 lb, delivering long-term durability that helps reduce aircraft downtime and maintenance costs.
Professionals across the aerospace industry trust 3M's proven track record of quality and performance. The 3M 8641 protective tape is used on critical aircraft components including spoilers, flaps, and fuselage panels where impact resistance and surface protection are paramount. By reducing rework, waste, and service interruptions, this tape delivers significant cost savings while maintaining the highest standards of reliability and longevity. Whether protecting against environmental damage from rocks, debris, rain, and dirt, or providing FOD protection in high-risk operational areas, the 3M Polyurethane Protective Tape 8641 represents the industry standard for aerospace surface protection.
Key Features
- 41 mil polyurethane elastomer backing provides exceptional impact resistance and foreign object damage (FOD) protection
- Pressure-sensitive foam acrylic adhesive bonds immediately to multiple substrates with consistent long-term adhesion
- Available in both perforated and non-perforated versions for pressurized and non-pressurized applications
- Conformable tape easily applies to curved surfaces and can be painted over or applied to painted surfaces
- Exceptional abrasion, erosion, scratch, and puncture resistance for extended service life and reduced maintenance
- Dielectric strength of 280 V/mil provides electrical insulation properties for sensitive aircraft systems
- Operates in extreme temperature range from -40°F to high service conditions with adhesive stability
- Qualified to military and commercial aircraft specifications for aerospace compliance and reliability
Technical Specifications
| Specification |
Value |
| Product Name | 3M Polyurethane Protective Tape 8641 |
| Part Number | 8641 |
| 3M Product Number | 8641 |
| 3M ID | B40069130 |
| Backing Material | Polyurethane |
| Backing Thickness (Imperial) | 25 mil |
| Backing Thickness (Metric) | 0.64 mm |
| Total Thickness | 41 mil |
| Adhesive Type | Foam Acrylic |
| Adhesion Strength (Imperial) | 75.1 lb |
| Adhesion Strength (Metric) | 82.2 N/100mm |
| Tensile Strength (Imperial) | 93 lb/in |
| Tensile Strength (Metric) | 1629 N/100mm |
| Dielectric Strength | 280 V/mil |
| Minimum Installation Temperature (Fahrenheit) | 60°F |
| Minimum Installation Temperature (Celsius) | 15°C |
| Minimum Operating Temperature (Fahrenheit) | -40°F |
| Minimum Operating Temperature (Celsius) | -40°C |
| Application | Surface Protection |
| Product Usage | Aerospace |
| Brand | 3M |
| Availability | Perforated and Non-Perforated |
| Surface Compatibility | Adheres to multiple substrates, paintable surfaces compatible |
| Environmental Resistance | Abrasion, erosion, scratch, and puncture resistant |
| Removability | Easily removable at end of service life |
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