3M 3381 Foil Tape 2 13/16 in x 49 yd Silver

3M 3381 Foil Tape for HVAC Sealing

This aluminum foil tape uses an acrylic adhesive to seal HVAC ductwork and insulation in both indoor and outdoor environments. It is suited for technicians and facility managers who need a continuous roll for assembly, manufacturing or maintenance tasks. The silver backing conforms to irregular surfaces while resisting moisture and temperature cycling. It is not intended for buyers who need a structural bonding tape or a product rated beyond the listed temperature limits.

Capacity and Temperature Headroom

The roll provides 49 yards of 2-13/16 inch wide tape for long continuous runs on large duct systems. It performs reliably from -30 degrees F to 260 degrees F, covering typical heating and cooling cycles without adhesive failure. The acrylic adhesive maintains bond strength across this range but will degrade if exposed to temperatures above the maximum rating. It does not suit applications requiring continuous service above 260 degrees F or cryogenic conditions below -30 degrees F.

Integration into HVAC Builds

The continuous roll format allows custom lengths to be cut on site, reducing waste and speeding up installation on rectangular or round ductwork. The aluminum backing acts as a vapor barrier and reflects radiant heat, complementing insulated duct systems. No special tools are required beyond a knife or scissors for cutting. The tape does not replace mechanical fasteners for load-bearing joints or UL-listed fire-stop assemblies where specific certifications are mandated.