| http://www.w3.org/ns/prov#value | - The first group of particles having a small specific gravity may comprise one or a plurality of groups of non-metal particles having a maximum particle diameter equal to or smaller than the deflocculation limit (6 ??m), such as of an oxide such as alumina, zirconia, magnesia, silica, or the like, a carbide such as silicon carbide, titanium carbide, or the like, a nitride such as silicon nitride, a
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