a. flexible package b. aseptic c. shrink films d. alminum foil e. plastics f. paper ( ) The primary flexible metal which provides the best b arrier material that is available. ( ) give structure to the flexible package and provide an excellent printing surface. ( ) the absence or exclusion of microorganisms. ( ) provide an economical, versatile and lightweight package in the form of wraps, bags and pouches, most of which are sngle web. ( ) They are used because of their transparency, heat sealing ability, and moisture resistance. ( ) The films have a memory built into them by stretching while in the soft stage, then cooled. This memory allows the material to shrink back to its original size when subjected to heat.