| http://www.w3.org/ns/prov#value | - Such other materials include foams such as PVC foam, polystyrene foam, polyurethane foam, polypropylene foam, polyethylene foam, and the like; wood including balsa, cedar, and the like; and materials such as COREMAT??? or SPHERETEX???, which are materials consisting of a low density felt-like resins filled with low density microspheres.
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