prov:value
| - The organic materials include cellulose derivatives, such as cellulose acetate, cellulose acetate-butyrate, and cellulose acetatepropionate, thermoplastic synthetic resins, such as polyvinyl resins, i. e., polyvinyl alcohol (wateror organic solvent-soluble), polyvinyl chloride, copolymers of vinyl chloride and vinyl acetate, polyvinyl butyral, polystyrene polyvinylidene chloride, ,@5-PQ1ym g hyl m
|