| http://www.w3.org/ns/prov#value | - If the substrate is plastic it may be rigid or flexible and may be acrylic, (e.g. polymethylmethacrylate), sheet material, polycarbonate sheet material, polyester, various types of vinyl, fluorocarbon polymers, polyolefins, polystyrene, polyurethane, acetate or any plastic material that can be formed into transparent sheets, either rigid or flexible.
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