| http://www.w3.org/ns/prov#value | - Non-metallic materials which may be used comprise inherently heat-scalable sheets, pellicles and films formed of cellulose ethers, cellulose esters, synthetic resins, halogenated rubber and the like, or of materials such as regenerated cellulose, elatin, casein, and the like., These materials which are not heat-sealable per sebut may be rendered neat-scalable by being coated with a heat-scalable c
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