| http://www.w3.org/ns/prov#value | - Examples of these materials are polystyrene, polyvinyl chloride, polyethylene, polypropylene, polyacrylonitrile, polybutadiene, polyisoprene, polytetrafluoroethylene, polyesters, melamine, urea, phenol resins, silicate resins, polyacetal resins, polyepoxides, polyhydantoins, polyureas, polyethers, polyurethanes, polyisocyanurates, polyimides, polyamides, polysulphones, polycarbonates, and copolyme
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