Scotch� Aluminum Foil Tape 3311 is a dead-soft, general purpose, aluminum foil backed tape with a paper liner designed for maximum adhesion over clean, dry surfaces. It features a high tack, pressure sensitive, rubber adhesive which is ideally suited for difficult to adhere to surfaces such as low energy substrates. Can be used in most weather conditions and 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.