| http://www.w3.org/ns/prov#value | - As the plastic material, there are preferably used polymethyl methacrylate, methyl methacrylate copolymers, polycarbonates, diethylene glycol bisallyl carbonate polymers (CR-39), polyesters, especially polyethylene terephthalate, unsaturated polyesters and epoxy resins.
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