3M 425 ALUMINUM FOIL TAPE
Harmonization Code : 76072099 | Aluminium foil (whether or not printed or backed with paper, paperboard, plastics or similar backing materials) of a thickness (excluding any backing) not exceeding 0,2 mm
Main features
- Aluminum Backing with Acrylic Adhesive
- Great for Sealing
- Low Moisture Vapor Permeability
Product Description
3M™ Aluminum Foil Tape 425 is a pressure-sensitive aluminum foil tape designed for sealing, shielding, masking, heat reflection, and general-purpose industrial applications. It combines a dead-soft aluminum foil backing with a high-performance acrylic adhesive to provide excellent conformability, durability, and environmental resistance. The tape reflects heat and light, helps dissipate heat from surfaces, and provides reliable sealing and protection in indoor and outdoor environments, making it suitable for aerospace, transportation, appliance, HVAC, and general industrial applications.
Key features
- Dead-soft aluminum foil backing: suitable for conforming to curved, irregular, and complex surfaces while maintaining reliable coverage and protection.
- High-performance acrylic adhesive: suitable for providing durable adhesion to a variety of substrates in both indoor and outdoor environments.
- Heat reflection and thermal management: suitable for reflecting radiant heat and light while supporting heat dissipation in demanding applications.
- Moisture barrier performance: suitable for protecting surfaces, seams, and joints from moisture penetration and environmental exposure.
- Environmental resistance: suitable for applications requiring resistance to UV exposure, weathering, chemicals, and temperature fluctuations.
- Conformable construction: suitable for wrapping around contours, edges, and uneven surfaces where flexibility and surface contact are required.
- Flame-resistant properties: suitable for applications requiring flame-resistant tape performance and compliance with industry requirements.
- Versatile industrial performance: suitable for sealing, masking, patching, shielding, and general-purpose protection applications across multiple industries.
Applications
3M™ Aluminum Foil Tape 425 is suitable for industrial applications where heat reflection, environmental sealing, moisture protection, surface masking, and durable foil-backed performance are part of the application requirements.
- Aircraft paint stripping maskant: suitable for protecting selected aircraft surfaces during paint stripping, refinishing, and maintenance operations.
- Moisture barrier for appliances: suitable for sealing joints and components in refrigerators, freezers, and other white goods where moisture protection is required.
- Heat reflection and dissipation: suitable for applications requiring radiant heat reflection, thermal shielding, and heat dissipation support.
- Wire and cooling coil attachment: suitable for mechanically securing wires, tubing, and cooling coils in appliance and refrigeration assemblies.
- Repair and maintenance applications: suitable for patching tears, covering surface damage, and extending the service life of trailers, aircraft, and metal structures.
- Thin-gauge foil splicing: suitable for joining, repairing, and splicing aluminum and other thin metal foils during manufacturing processes.
- General-purpose sealing and patching: suitable for indoor and outdoor holding, sealing, patching, masking, and surface protection applications.
Related resources
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Mechanical Properties
Additional Information
3M™ Aluminum Foil Tape 425
3M Aluminum Foil Tape 425 is a conformable aluminum foil tape designed for heat reflection, moisture sealing, masking, shielding, and general industrial applications. It features a dead-soft aluminum foil backing with a high-performance acrylic adhesive that provides reliable adhesion to a variety of substrates, including metals and other common industrial surfaces.
Note: Property values shown are typical and not intended for specification. Verify suitability under your geometry, dispense method, and cure profile.
Key Features
- Fast and easy to use
- Flame resistant
- Can be cetified to meet L-T-80C
- Meets requirements of FAR 25.853
- Very low moisture vapor transition rate, makes the tape ideal for sealant applications
Processing Summary
Typical Physical Properties
| Property | Typical value | Test method |
|---|---|---|
| Color | Shiny Silver | |
| Adhesive Type | Acrylic | |
| Approximate Weight | 5.54 g/m/24 mm | |
| Adhesive Carrier | Dead Soft Aluminum | |
| Total Tape Thickness | 1.6 mm | ASTM D3652 |
| Backing Thickness | 0.07 mm | ASTM D3652 |
| Water Vapor Transmission | 0.77 g/m²/24 h | ASTM D3833 |
| 180° Peel Adhesion | 5.1 N/cm at 22 °C | ASTM D3330 |
| Elongation at Break | 6 % | ASTM D3759 |
| Tensile Strength | 49 N/cm | ASTM D3759 |
| Long Term Temp Resistance | 149 °C | |
| Minimum Long Term Temp Resistance | -54 °C | |
| Industry Specifications | UL 746C (File E 122798) UL 723 Class “L” low flammability rating (File R 7311) Can be certified to meet L-T-80C FAR 25.853(a |
Surface Preparation and Application Techniques
Proper surface preparation and application technique are critical to achieving the maximum bond strength, durability, and long-term performance of 3M VHB™ Tape 5962F across a wide range of industrial substrates and operating conditions.
Exceptions that may require additional surface preparation include:
• Heavy Oils: A degreaser or solvent-based cleaner may be required to remove heavy oil or grease from a surface and
should be followed by cleaning with IPA/water.
• Abrasion: Abrading a surface, followed by cleaning with IPA/water, can remove heavy dirt or oxidation and can
increase surface area to improve adhesion.
• Adhesion Promoters: Priming a surface can significantly improve initial and ultimate adhesion to many materials such
as plastics and paints.
• Porous surfaces: Most porous and fibered materials such as wood, particleboard, concrete, etc. need to be sealed to
provide a unified surface.
• Unique Materials: Special surface preparation may be needed for glass and glass-like materials, copper and copper
containing metals, and plastics or rubber that contain components that migrate (e.g. plasticizers).
*Note: Initial tape application to surfaces at temperatures below these suggested minimums is not suggested because the adhesive becomes too firm to adhere readily. Ideally, all substrates and tape should be conditioned above the minimum application temperature in covered, weatherproof conditions until it is verified the substrates are at or above the minimum temperature. Once properly applied, low-temperature holding is generally satisfactory.
Bond Build Rate
After application, the bond strength will gradually increase as the adhesive flows onto to the surface (also referred to as “wet out”). The bond build rate will depend on both tape and substrate, but generally, at room temperature, approximately 50% of ultimate bond strength will be achieved after 20 minutes, 90% after 24 hours, and 100% after 72 hours. Adhesive flow is faster at higher temperatures and slower at lower temperatures. Ultimate bond strength can be accelerated (and in some cases bond strength can be increased) by exposure to elevated temperature (e.g. 66°C [150°F] for 1 hour). This can provide better adhesive wet out onto the substrates. Abrasion (~180 grit), or the use of primers/adhesion promoters, can also increase both bond strength as well as the bond build rate.
