3M 438 Heavy Duty Aluminum Foil Tape Silver, 2 1/2 in x 60 yd

3M(TM) Heavy Duty Aluminum Foil Tape 438 Silver, 2 1/2 in x 60 yd 7.2 mil 3M(TM) Heavy Duty Aluminum Foil Tape 438 Silver, 7.2 mil (0.18 mm) aluminum foil tape with pressure sensitive acrylic adhesive. 3M(TM) Heavy Duty Aluminum Foil Tape 438, 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. Acrylic adhesive supplies superior temperature, U.V. and solvent resistance. It provides excellent age life and is ideal for harsh, long-term outdoor environments. Thickest aluminum foil tape. Meets F.A.R 25.853(a) and meets UL 723 Class L