| http://www.w3.org/ns/prov#value | - In the latter category, components which may be admixed, in minor proportions, with the silica hydrogel particles prior to milling and/or just prior to agglomeration include those prepared separately from inorganic oxides such as magnesium oxide, titanium oxide, thorium oxide, e.g., oxides of Groups 4 and 16, as well as other particulate constituents.
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