3M™ Heavy Duty Aluminum Foil Tape 438 is a thick aluminum foil tape with an acrylic adhesive designed for applications requiring a heavier-duty foil backing and long-term durability.
With a total thickness of 7.2 mil (0.18 mm), it provides a robust foil layer that delivers excellent strength, conformability, and thermal conductivity across a wide temperature range.
Its acrylic adhesive system offers long aging performance both indoors and outdoors, making it ideal for demanding industrial and environmental conditions.