3M™ Aluminum Foil Tape 3340 is a high strength aluminum foil tape with a cold weather acrylic adhesive designed for HVAC duct sealing and high performance closure applications.
With a total thickness of 3.9 mil (0.09 mm), it provides a durable foil backing that performs reliably in both high heat and high humidity environments.
This tape is UL181A-P and UL181B-FX listed, making it suitable for sealing rigid duct board and flexible duct systems where code compliance and long-term performance are required.