This Aluminum Foil Tape is a special 1.5 mil (38 µ) high strength aluminum foil tape with a higher tack, and a special C.W. cold weather acrylic adhesive system. The unique formulation combines extremely high quick stick at normal temperatures with superior performance at low temperatures and high humidity. Primary use: The thinner material allows for superior conformability in vapor sealing of fiberglass ductboard and FSK systems.