| http://www.w3.org/ns/prov#value | - Such materials may include microbeads of metal, glass, carbon, mica, quartz or other minerals, plastic such as acrylic or phenolic, including acrylic microspheres known as PM 6545 available from PQ Corporation of Pennsylvania, and hollow microspheres such as the cross-linked acrylate SunSpheres??? of ISP Corporation (Wayne, N.J.) and similar hollow spheres as well as expandable spheres such as Exp
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