3M™ Foil Tape 3340 is ideal for sealing rigid fiberglass duct boards and flexible (non-metallic) air duct and connector systems. Our tape meets requirements for UL 181 A-P and UL 181 B-FX Listings as a measure of reliability and quality standards.
Conformable tape resists flame, moisture, weather, UV degradation, and many chemicals
2.0 aluminum foil backing is ideal as a vapor seal tape for duct closure
Thermally conductive backing helps heating and cooling efficiency
Heat and light reflective tape protects insulates and enhances lighting efficiency
Permanent acrylic adhesive combined with the durable 2.0 mil backing provides long service life
We constructed this tape using a 2.0 mil aluminum foil backing with strong, pressure sensitive acrylic adhesive for long-term adhesion along with a paper liner to protect the adhesive and keep the tape ready for use. This tape has excellent heat and light reflection to protect against high temperatures and U.V. degradation. It is also flame, moisture, weather, and chemical resistant. The combination of the foil backing and acrylic adhesive gives our tape an operational temperature range of -300 to 2500F/-340 to 1210C.
The foil backing also serves as an excellent barrier against moisture, dust, flame, and many chemicals. Its very low moisture vapor transmission rate also makes the tape a good sealant.
The acrylic adhesive supplies superior temperature, U.V. and solvent resistance to give you a strong, lasting and reliable bond. It provides excellent age life and is ideal for long-term indoor and outdoor environments.
Adhesion to Steel oz/in (N/100 mm)
Sealing HVAC & Duct Work
Backing Thickness (metric)
Transportation, Specialty Vehicle, Metalworking, Construction, Automotive, Military & Government, General Industrial, MRO, Electronics, Aerospace