Benefits
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Helps seal seams and joints in sheet-metal and fibrous ductwork.
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Supports vapor sealing over fiberglass and mineral wool insulation.
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Helps reduce moisture penetration through properly sealed joints.
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Conforms to corners and curved surfaces without requiring complex tooling.
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Allows convenient application in cold-weather conditions when used within the recommended limits.
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Provides a practical solution for general-purpose heat shielding and light reflection.
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Helps simplify installation and maintenance of HVAC systems.
Technical Specifications
| Property | Typical Specification |
|---|---|
| Product name | 3M Aluminum Foil Tape 3380 |
| Product type | Single-sided aluminum foil tape |
| Color | Silver |
| Backing | Annealed aluminum foil |
| Adhesive | Cold-weather acrylic pressure-sensitive adhesive |
| Release liner | PE-coated kraft paper |
| Backing thickness | 0.05 mm (2.0 mil) |
| Total tape thickness | Approx. 0.08 mm (3.25 mil) |
| Liner thickness | Approx. 0.08 mm (3.1 mil) |
| 180° peel adhesion to steel | Approx. 4.3 N/cm |
| Tensile strength | Approx. 17.5 N/cm |
| Elongation at break | Approx. 4% |
| Long-term service temperature | -40°C to 127°C |
| Minimum application temperature | As low as -23°C, per 3M product information |
| Example standard roll size | 48 mm × 45 m |
| Other available widths | Varies by product configuration |
| Flame classification | UL 723 |
| Additional approval | US Coast Guard approval is stated in 3M documentation; verify the current applicable approval |
Note: Values are typical reference data, not guaranteed specifications. Application temperature and service temperature are different measurements. Confirm the current regional technical data sheet and exact SKU before specifying the product.
Applications
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Sealing seams and joints in sheet-metal ductwork.
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Sealing joints in fibrous ductboard.
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Sealing fiberglass insulation facings and blankets.
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Sealing mineral wool insulation where substrate compatibility is confirmed.
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HVAC duct installation, repair, and maintenance.
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General-purpose heat shielding.
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Light-reflective applications.
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Moisture-barrier and vapor-sealing applications.
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Selected appliance and industrial insulation applications.
Compatible Materials
Potential substrates include:
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Aluminum and other clean metal surfaces.
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Sheet-metal ductwork.
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Galvanized steel, subject to surface condition.
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Fibrous ductboard.
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Suitable fiberglass insulation facings.
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Selected mineral wool insulation facings.
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Other clean, dry surfaces validated for the intended application.
Adhesion depends on substrate condition, surface cleanliness, temperature, and environmental exposure. Test the tape on the actual substrate before large-scale use.
Industries
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HVAC and ventilation.
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Commercial and residential construction.
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Building insulation.
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Industrial equipment and facility maintenance.
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Sheet-metal fabrication.
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Appliance manufacturing.
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Heating and cooling equipment.
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Transportation and specialty vehicle manufacturing.
Why Choose 3M 3380?
3M 3380 combines flexible aluminum foil backing with a cold-weather acrylic adhesive and a convenient release liner. It is designed for general-purpose sealing and insulation applications where conformability, moisture-barrier performance, and cold-weather bonding are important.
Compared with high-temperature aluminum foil tapes that use silicone adhesive, 3M 3380 is more specifically suited to duct sealing, insulation joints, and general-purpose reflective applications rather than extreme-temperature aerospace use.
Yousan can help evaluate tape selection, roll-width requirements, slitting, and precision converting options based on your application and specifications.
Installation Guide
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Prepare the surface: Remove dust, grease, moisture, and loose particles. Ensure the substrate is clean and dry.
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Check the temperature: For best adhesion, apply to a clean, dry surface above 0°C unless the applicable product instructions state otherwise.
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Measure and cut: Cut the required length with a suitable dispenser or cutting tool.
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Position the tape: Center the tape over the seam or joint.
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Remove the liner: Peel away the release liner without touching or contaminating the adhesive.
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Apply pressure: Press the tape firmly and evenly across the full bonding area.
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Inspect the seal: Check for wrinkles, gaps, and lifted edges.
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Validate the installation: For regulated duct systems or critical insulation barriers, confirm that the completed assembly meets the relevant project requirements.
Storage
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Store in a clean, dry environment.
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Keep the tape in its original packaging until use.
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Protect it from direct sunlight, moisture, dust, and chemical contamination.
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Avoid excessive heat and prolonged exposure to unsuitable storage conditions.
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Follow the storage recommendations and shelf life specified in the current 3M documentation.
FAQ
1. What is 3M 3380 aluminum foil tape used for?
It is commonly used for sealing sheet-metal and fibrous ductwork, insulation joints, moisture barriers, and general-purpose heat-reflective applications.
2. Is 3M 3380 suitable for cold-weather applications?
Yes. Its cold-weather acrylic adhesive is designed to bond at application temperatures as low as -23°C. Actual results depend on substrate condition and application procedure.
3. What is the service temperature range of 3M 3380?
3M lists a long-term service-temperature range from -40°C to 127°C. This should not be confused with the minimum application temperature.
4. Does 3M 3380 have a release liner?
Yes. It features a polyethylene-coated kraft paper liner that protects the adhesive before application.
5. Can 3M 3380 be torn by hand?
Yes. Its flexible aluminum foil construction is designed for convenient hand tearing and on-site installation.
6. Is 3M 3380 suitable for HVAC duct sealing?
Yes. Sealing sheet-metal and fibrous ductwork is one of its main applications. Always confirm compliance with the applicable duct-system requirements.
7. Is 3M 3380 waterproof?
It provides low water vapor transmission and can support moisture-barrier sealing. However, the tape alone does not guarantee a waterproof assembly; joint design, surface preparation, and installation quality matter.
8. Is 3M 3380 suitable for extreme high-temperature applications?
It is rated for long-term service up to 127°C. For higher temperatures, evaluate a tape specifically designed for the required operating conditions.
9. Can 3M 3380 be supplied in custom widths?
The product is available in different standard widths. Custom slitting or converting should be confirmed based on material availability, order requirements, and the intended application.
Downloads
Available upon request:
- 3M 3380 Aluminum Foil Tape Technical Data Sheet (TDS)
- Safety Data Sheet (SDS)
- Product Brochure
- Die-Cutting Capability Guide
Please contact our sales team if you require the latest technical documentation.
