| http://www.w3.org/ns/prov#value | - Examples of such additional metals and metalcompounds include In, Te, Bi, Se, Sb, Ge, Sn, Al, Be, TeO.sub.2, SnO, As and Cd.Further, examples of the optional additives include polymer materials such as ionomer resins, polyamide resins, vinyl resins, natural polymers, silicones, and liquid rubbers; silane coupling agents, stabilizers such as transition metal complexes,dispersants, flame-retardants,
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