3M 7100043891 Aluminum Foil Tape 3.89 in 50 Yd Silver

Product Description

The 3M 7100043891 is a dead soft aluminum foil tape engineered for duct sealing, insulation facing repairs, and general HVAC fabrication work. The 1.8 mil aluminum foil carrier is coated with a cold weather acrylic pressure-sensitive adhesive that bonds in low-temperature conditions where standard adhesives fail. The tape measures 3.89 inches wide and 50 yards long per roll, offering broad coverage for seam sealing and patching applications. It is hand tearable, which speeds up installation without the need for a dispenser or cutting tool. Licensed HVAC technicians, sheet metal workers, and mechanical insulation contractors are the primary installers of this product.

This tape is suited for residential and commercial HVAC ductwork, mechanical insulation jacketing, and vapor barrier repairs. Its cold weather adhesive makes it particularly useful for work performed in unconditioned spaces such as attics, crawlspaces, and equipment rooms during cooler months. The UL723 and ULC S102 flame and smoke classifications make it appropriate for use in applications where fire-rated materials are specified by code or project requirements.

Key Features

• 1.8 mil dead soft aluminum foil construction conforms easily to irregular surfaces
• Cold weather acrylic pressure-sensitive adhesive bonds in low-temperature environments
• Hand tearable — no dispenser or blade required during installation
• UL723 Classified with a 5/10 Flame/Smoke Rating
• ULC S102 Classification with a 10/0 Flame/Smoke Rating
• 3.89 inch width provides broad coverage for duct seams and insulation repairs

Compatibility

Designed as an OEM-style replacement and general-use foil tape for residential and commercial HVAC ductwork sealing, mechanical insulation jacketing repairs, and vapor barrier applications.

Installation Notes

Installation is typically performed by licensed HVAC technicians or mechanical insulation contractors. Before applying, ensure the substrate surface is clean, dry, and free of dust or oils to achieve full adhesive contact. When working on active duct systems, shut down the air handler or furnace before accessing ductwork to avoid pressurized air interference during tape application. Follow applicable mechanical codes including SMACNA duct sealing standards for fire-rated assembly requirements.

Technical Specifications

• Tape Width: 3.89 inches
• Tape Length: 50 yards per roll
• Foil Thickness: 1.8 mil
• Foil Material: Dead soft aluminum
• Adhesive Type: Cold weather acrylic pressure-sensitive
• Color: Silver
• Unit of Measure: Roll
• Minimum Order Quantity: 12
• Weight: 33.70 pounds
• Fire Classification: UL723 (5/10 Flame/Smoke), ULC S102 (10/0 Flame/Smoke)
• UPC: 051128960214

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100043891