and non plasticized polyvinyl chlorides and vinyl chloride acetate copolymers vinylidene chloride vinyl chloride copolymers polycarbonates polyimides polymethylpentene cellulosic films such as cellulose acetate cellulose triacetate cellulose acetate butyrate cellulose propionate ethyl cellulose regenerated cellulose cellophane the fluoroplastics such as ethylene chlorotrifluoroethylene copolymers ethylenetetrafluoroethylene copolymers fluorinated ethylene propylene copolymers perfluoroalkyl polymers polychlorotrifluoroethylene copolymers polytetrafluoroethylene polyvinyl fluoride and polyvinylidene fluoride generally the polymeric carrier is employed in a thickness of 0 5 3 mills some of the polymers such as polypropyene and polyethylene are used in greater thicknesses of for example 3 5 mils for handling purposes since some films are flimsy and difficult to handle in smaller thicknesses the polyvinyl polymeric carriers generally are most useful from a handleability standpoint at a thickness of about 1 2 to 4 mils the polyesters on the otherhand can be used in very small thicknesses on the order of 0 5 1 5 mils to provide excellent handleability while maintaining ultimate elongation tensile strength and yield strength within the required values any suitable laminating adhesive can be used to bond the foil to the polymeric carrier for example any pressure sensitive contact heat activated ultraviolet light activated solvent based contact aerobic or anaerobic sealants are useful in bonding the foil to the polymeric carrier if a solvent based sealant is used the solvent should be driven off prior to.