prov:value
| - In the above described process, Al2 O3, TiO2, SiO2, ZrO2, C, SiC, Si3 N4, V2 O5, Cr2 O3, Fe2 O3, CoO, NiO, CuO, MnO salts of Nd and Sm, and other oxides and compounds can be added, as a dispersing agent, to a solution of a silicate or silicic acid, but it is required that the dispersing agent has a size of at most 70 microns and is added in a proportion of 70% or less.
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