3M 7100189974 | 50 yd x 2.500" Width Aluminum Tape

Description

3M 7100189974 is a professional-grade aluminium foil tape 3340 that provides dependable sealing in HVAC, ductwork, and industrial applications. The silver foil backing conforms well to irregular surfaces while providing a long-lasting vapour and moisture barrier. Its pressure-sensitive acrylic adhesive provides excellent initial tack and long-lasting adhesion to metal, insulation facings, and flexible duct materials. This 2.5" x 50 yd roll is designed for performance, balancing ease of use with high-temperature stability and tear resistance. When a long-lasting seal is required to reduce air leakage and improve thermal efficiency, use 3M silver foil tape 3340. The tape's design allows for installation in both new assemblies and maintenance/repair projects. Buyers who prioritise specifications will value measurable characteristics such as width, length, adhesion type, and service temperature limits. This product is designed for technicians and contractors who need consistent, repeatable sealing performance.

Product Features and Benefits

Aluminum foil backing for thermal and vapour protection

The 3M 7100189974 features a layer of aluminium foil that acts as a continuous moisture and vapour barrier. It also increases thermal reflectivity and long-term durability of HVAC components.

Pressure-sensitive acrylic adhesive

A permanent acrylic adhesive gives strong initial tack and sustained bond to metal, foil-faced insulation, and flexible ducts. Designed to resist edge lift under normal service conditions.

High-temperature stability

The 3M Aluminium Foil Tape 3340 is rated to withstand high operating temperatures for duct systems and industrial applications. Despite repeated thermal cycles, the tape maintains its adhesion and mechanical integrity.

Conformable and tear-resistant

The backing conforms easily to curved and irregular surfaces while remaining resistant to tearing during application. This reduces installation time and the need for mechanical fasteners.

Trade-ready roll size and handling

The 3M silver foil tape 3340 is supplied as a 2.5" x 50 yd roll for convenient handling and fewer roll changes on the job. The roll format suits both field technicians and shop environments.

Frequently Asked Questions

Is 3M 7100189974 suitable for HVAC duct sealing?

Yes, this 3M aluminium foil tape 3340 is designed specifically for HVAC duct sealing and repairs.

Is 3M foil tape heat resistant for high-temperature applications?

Yes, the tape is formulated for high-temperature stability and retains adhesion across common HVAC service ranges.

How to use 3M foil tape for best results?

Clean and dry surfaces, apply firm pressure across the tape, and smooth from centre outward to remove air pockets.

Is 3M high-temperature aluminium foil tape appropriate for insulation seams?

Yes, it provides an effective vapour and moisture barrier when applied correctly over insulation seams and facings.

Warning:

This product can expose you to materials and/or chemicals including arsenic, lead, and other materials and/or chemicals which are known to the state of California to cause cancer and/or reproductive harm.

For more information, visit www.P65Warnings.ca.gov