Wet milling by a multi-ring media mill was carried out for aqueous slurries of Mg(OH)(2) and TiO2 powder mixtures in the concentration range from 6.9 to 50 wt%. Rings used as grinding media were made of partially stabilized zirconia or polyoxymethylene. Products were characterized by thermogravimetry-differential thermal analysis. X-ray diffractometry and EPMA. ZrO2 contamination in the product was: determined by X-ray flurescence analysis. The temperature of endothermic peaks of dehydration remained almost unchanged regardless of slurry concentration but decreased with increasing compressive force exerted by grinding rings. The homogeneity of the product is correlated with the temperature of exothermic peaks above 1100 K due to the crystallization of MgTiO3. but not with the endothermic peaks around 650 K. The increase of the slurry concentration increases the homogeneity of the product. facilitating the formation of single-phase MgTiO3 on subsequent heating. The increase of the compressive force of grinding rings brings about not only the homogeneity but also the phase purity of MgTiO3.