prov:value
| - Thus the working material may comprise at least one of the followng materials, plasticised polyvinyl chloride, a copolymer of vinyl chloride and vinylidene chloride or vinylacetate, a butadiene-styrene copolymer, a polyester, a polyamide for example nylon, a polyesteramide, a polyvinyl formal, a polyvinyl alcohol, a polyacrylate for example polymethyl methacrylate, or a polystyrene.
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