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In page Polystyrene:
"Polystyrene is commonly injection molded, vacuum formed, or extruded, while expanded polystyrene is either extruded or molded in a special process. Polystyrene copolymers are also produced; these contain one or more other monomers in addition to styrene. Expanded polystyrene composites with cellulose[4][5] and starch[6] have also been produced. Polystyrene is used in some polymer-bonded explosives (PBX).[citation needed]
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