This tape is made of a special UV resistant treated polypropylene film and coated with high shear, high tack acrylic adhesive. Main uses are sealing flexible air ducts and air connectors, sealing of metal duct and connections and sealing of foam insulation used for water pipes. Makes an excellent alternative to aluminum foil tape. No liner makes it easier and faster to use and delivers a tighter seal due to the elongation characteristic of the film.