Scotch Aluminum Foil Tape 3311 Silver, 2 in x 10 yd 3.6 mil (Pack of 1) 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