Dead soft malleable aluminum foil coated with an aggressive high-temperature acrylic/rubber adhesive system, providing an excellent vapor seal and conforming well to irregular surfaces of both fibrous and sheet metal ducts. High-Quality Tapes for HVAC Systems, like aluminum foil tapes, are coated with a special cold-weather acrylic/rubber sensitive adhesive system that combines superior quick stick at normal temperatures with exceptional low-temperature performance at freezing. These tapes are recommended for use at normal and elevated temperatures.