3M™ Aluminum Foil Tape 431 is a dead soft aluminum foil tape with an acrylic adhesive designed for general purpose sealing, masking, splicing, and surface protection applications.
With a total thickness of 3.1 mil (0.08 mm), it provides a highly conformable foil backing that easily adapts to irregular surfaces while delivering strong adhesion and long-term durability.
Its low moisture vapor transmission and reflective foil surface make it ideal for sealing, patching, and heat reflection in both indoor and outdoor environments.