prov:value
| - Specific examples of the metals include metals such as alumina, silica, titania, boria, zirconia and the like, and composite metals such as silica-alumina, silica-magnesia, alumina-magnesia, alumina-titania, silica-titania, alumina-boria, alumina-zirconia, silica-zirconia, alumina-phospha and the like.
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