Benefits
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Supports reliable sealing in cold-weather installation conditions.
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Helps control moisture vapor transmission through compatible duct and insulation joints.
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Conforms to curved and irregular surfaces for improved coverage.
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Provides durable adhesion in demanding temperature and humidity conditions.
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Simplifies on-site installation with a hand-tearable backing.
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Helps reduce gaps and leakage at suitable duct seams and insulation joints.
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Offers a practical solution for HVAC contractors, insulation installers, and industrial maintenance teams.
Technical Specifications
| Property | Typical Value |
|---|---|
| Product Name | 3M™ Aluminum Foil Tape 2C120 |
| Product Number | 2C120 |
| Backing Material | Dead-soft aluminum foil |
| Adhesive Type | Cold-weather solvent acrylic pressure-sensitive adhesive |
| Color | Natural aluminum / silver |
| Backing Thickness | 0.05 mm (1.8 mil) |
| Total Tape Thickness | 0.09 mm (3.4 mil) |
| Release Liner | Yes |
| 180° Peel Adhesion | 4.9 N/cm at approximately 22–23°C |
| Tensile Strength | 36.8 N/cm |
| Elongation at Break | 8% |
| Long-Term Temperature Resistance | -40°C to 127°C |
| Minimum Bonding/Application Temperature | As low as -23°C, subject to application conditions |
| Standard Roll Length | 45.7 m (50 yd) |
| Flame/Smoke Classification | Check the current regional 3M documentation |
| Technical Data Reference | 3M Technical Data Sheet, September 2024 revision |
Note: The values above are typical technical data, not guaranteed specification limits. Application temperature and service temperature are different. Confirm the current technical data sheet and the applicable certification for the exact product configuration before purchase or specification.
Applications
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Vapor sealing for fibrous duct board
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Sealing sheet-metal ducts
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Sealing insulation blankets
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Sealing foil/scrim/kraft (FSK) insulation systems
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HVAC duct joint and seam sealing
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General-purpose insulation sealing
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Applications requiring flexible aluminum foil backing
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Industrial maintenance and repair
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Sealing compatible joints in temperature- and humidity-sensitive environments
Compatible Materials
Subject to surface preparation and application testing, 3M 2C120 is intended for use with:
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Fibrous duct board
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Sheet-metal duct surfaces
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Insulation blankets
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Foil/scrim/kraft (FSK) facings
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Compatible metal surfaces
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Other suitable duct and insulation system materials
Adhesion depends on surface cleanliness, surface energy, temperature, and application conditions. Test compatibility before using the tape on painted, coated, plastic, or other specialty surfaces.
Industries
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HVAC and building services
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Commercial and residential construction
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Building insulation
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Industrial facilities and maintenance
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Heating and ventilation equipment
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Transportation and specialty vehicles, subject to application evaluation
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Maintenance, repair, and operations (MRO)
Why Choose 3M 2C120 Aluminum Foil Tape?
3M 2C120 combines a high-strength aluminum foil backing with a cold-weather solvent acrylic adhesive. Its ability to conform to irregular surfaces, along with its hand-tearable construction and release liner, makes it suitable for many duct and insulation sealing tasks.
For HVAC contractors and industrial buyers, the tape offers a convenient option for vapor sealing in compatible duct board, sheet-metal duct, insulation blanket, and FSK systems.
When selecting the product, consider the duct construction, application temperature, operating temperature, moisture exposure, and applicable system certification. For applications requiring specific fire or smoke performance, verify the current 3M documentation rather than relying on generic aluminum foil tape classifications.
Installation Guide
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Prepare the Surface: Ensure the substrate is clean, dry, and free from dust, oil, grease, and loose particles.
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Check Application Conditions: Confirm that the surface and ambient temperatures are suitable for bonding. The product is designed for cold-weather applications, but actual adhesion depends on the substrate and conditions.
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Measure and Cut: Measure the joint or seam and cut the tape to the required length.
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Position the Tape: Center the tape over the joint or seam to provide adequate coverage.
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Apply Firm Pressure: Press the tape firmly against the surface and smooth it to minimize wrinkles and trapped air.
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Check Overlaps and Edges: Ensure that seams and edges are adequately covered and bonded.
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Inspect the Seal: Verify the finished application according to the requirements of the duct or insulation system.
Follow the current 3M instructions and applicable installation standards. For critical applications, conduct testing under actual service conditions.
Storage
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Store in the original packaging until use.
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Keep in a clean, dry environment away from direct sunlight.
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Protect the tape from excessive heat, moisture, dust, and chemical contamination.
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Avoid damage to the release liner and roll edges.
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Follow the storage conditions and shelf-life recommendations in the current 3M technical documentation.
FAQ
1. What is 3M 2C120 Aluminum Foil Tape used for?
It is primarily used for vapor sealing fibrous duct board, sheet-metal ducts, insulation blankets, and foil/scrim/kraft (FSK) insulation systems.
2. What adhesive does 3M 2C120 use?
It uses a cold-weather solvent acrylic pressure-sensitive adhesive designed for reliable bonding under demanding temperature and humidity conditions.
3. What is the thickness of 3M 2C120?
The typical aluminum foil backing thickness is 0.05 mm, and the total tape thickness is approximately 0.09 mm.
4. Can 3M 2C120 be applied in cold weather?
Yes. The product is designed for cold-weather applications and is specified to bond and seal at temperatures as low as -23°C (-10°F). Actual results depend on surface conditions and application technique.
5. What is the service temperature range?
The September 2024 technical data sheet lists long-term temperature resistance from -40°C to 127°C. Always confirm suitability for the actual application and exposure conditions.
6. Does 3M 2C120 include a release liner?
Yes. It has a release liner that protects the adhesive before application and supports handling during installation.
7. Is 3M 2C120 suitable for HVAC duct sealing?
It is designed for vapor sealing fibrous duct board, sheet-metal ducts, insulation blankets, and FSK systems. Verify that the product meets the specific requirements of the intended duct assembly.
8. Does 3M 2C120 have a UL classification?
Yes. 3M provides UL 723 and ULC S102 classification information for this product. Published flame and smoke ratings may differ by document revision or regional listing, so verify the applicable current documentation before making compliance claims.
9. Is 3M 2C120 electrically conductive?
The tape has an aluminum foil backing, but this does not establish electrical continuity through the adhesive. For grounding or EMI/RFI shielding, select a product with verified electrical performance data.
10. Can 3M 2C120 be die-cut?
Die-cutting feasibility depends on the shape, tolerance, release liner, tooling, and converting process. A production trial is recommended before confirming custom-converted parts.
Downloads
Available upon request:
- 3M 2C120 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.
