Scotch 3311 Aluminum Foil Tape, 2" x 10 yd, 3.6 mil, Silver (Case of 24) UL 723 rated for flame and smoke characteristics Can be used under all weather conditions; matches aluminum foil-faced duct systems and insulation; designed for maximum adhesion over clean, dry surfaces Measures 2" x 10 yd Resists water vapor, odor and smoke transmission For application ease, the adhesive is protected until the liner is removed Resists flame, moisture, weather, UV degradation, some chemicals, water vapor and smoke transmission Can be used in most weather conditions and at a wide variety of temperatures Thermal conductivity helps cooling and heating efficiency, improving efficiency in systems Conformable backing and pressure sensitive rubber adhesive adheres to a variety of smooth or irregular surfaces Acts as a vapor barrier to insure the integrity of the insulation system