MT-A7772 is a high strength aluminum foil tape coated with a superior performance flame retardant solvent acrylic adhesive. The foil material allows maximum conformability in vapor sealing fiberglass duct boards and FSK systems. A low moisture vapor transmission rate offers outstanding sealing and patching performance, providing an excellent vapor seal. This tape features good aging resistance both indoors and outdoors. A superior quick stick at normal operating temperatures and great performance at low temperatures.