The 3M 1521CW Foil Tape is a 2-inch wide aluminum foil tape with conductive acrylic adhesive. It has a thickness of 3.6 mils and is UL listed. The tape is used for EMI/RFI shielding, HVAC sealing, joining sheet metal, and other industrial applications requiring a tape with foil backing and conductive adhesive. It can withstand temperatures up to 250°F. The acrylic adhesive provides good adhesion to metals, glass, and many plastics. This 3M foil tape comes in 36 yard rolls and has a shelf life of 1 year when stored under normal conditions.