The specific gravity of ceramic grinding media beads in relation to (typically after adjusting bead proportional to viscosity of mill base) viscosity of operating medium is one of the most important aspects to consider when selecting your media type for use in a ceramic grinding application. An example of this would be the use of yttria stabilized zirconia (YSZ) in producing high density media (approx 6.0 g/cm³). YSZ may not be the best option however for very low viscosity materials where the use of aluminum oxide could cause more wear and tear on your mill lining than a heavier media. As part of my observations it would appear that one of the most important aspects to consider when matching the mechanical energy of the media with the hardness of the material being blended is how much kinetic energy the media is producing. Has anyone else gone through the calculation of determining the density ratio of the particular type bead(s) being used with respect to your final product prior to conducting trials?