ttorney, Agent, or Firm-Cesari & McKenna 5 7 ABSTRACT A fabricand fiber-free, heat-scalable structure useful as a barrier material limiting passage through itself of solids, liquids, semisolids, gases or forms of energy such as ultraviolet light, said structure comprising a first ply of a relatively tough, biaxially-oriented film of an organic polymer adhered to a second ply of a metallic foil and