3M™ Aluminum Foil Tape 427 is a dead soft aluminum foil tape with an acrylic adhesive and an easy-release liner, designed for sealing, masking, splicing, and surface protection applications.
With a total thickness of 4.6 mil (0.12 mm), it provides a thicker and more durable foil backing than standard foil tapes while maintaining excellent conformability.
Its low moisture vapor transmission and reflective surface make it ideal for long-term indoor and outdoor sealing, heat reflection, and general industrial use