prov:value
| - Matrix materials suitable for forming element 121 b include, for example, polyester such as polyethylene terephthalate, and plastics having good thermal stability such as polypropylene, cellophane, polycarbonate, cellulose acetate, triacetyl cellulose, polyethylene, polyvinyl chloride, polyvinyl alcohol, fluorine-containing resins, chlorinated rubber, and ionomer.
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