3M Aluminum Foil Tape 425 Silver, 4.6 mil (0.12mm), Dead-soft aluminum foil tape with a pressure sensitive acrylic adhesive 3M Aluminum Foil Tape 425, dead-soft aluminum foil backing, excellent heat and light reflection to protect against high temperatures and U.V. degradation. The foil also serves as an excellent barrier against moisture, dust, flame, and certain chemicals as used in aircraft paint stripping masking. Acrylic adhesive supplies superior temperature, U.V. and solvent resistance. It provides excellent age life and is ideal for harsh, long-term outdoor environments.