Protect Sensitive Parts From Heat and Flame 3M™ Aluminum Foil Tape 4380 is a general purpose, aluminum foil tape comprised of a 2.0 mil dead soft aluminum foil backing and a pressure sensitive acrylic adhesive. This tape is malleable and conforms well to uneven, curved or irregular surfaces. The aluminum backing offers and excellent reflective surface and is thermally and heat conductive for heating and cooling efficiency. It reflects light to enhance lighting efficiency and resists flame, moisture, weather, dust, UV degradation and many chemicals to provide long-lasting durability. Recommended Applications General use holding, patching and sealing applications Light reflecting Heat shielding applications Moisture and vapor barrier Thermal conducting All Around Performance Under a Wide Range of Temperatures 3M™ Aluminum Foil Tape 4380 is coated with a pressure sensitive acrylic adhesive designed to bond to a broad range of substrates. This tape adheres immediately upon contact and can perform under a wide spectrum of temperatures ranging from -30°F/-34°C to 300°F/149°C. Due to its low moisture transmission rate, this tape offers excellent sealing and patching performance. 3M™ Aluminum Foil Tape 4380 is UL 723 approved.