Slurries are aqueous dispersions of compact or mesopouros particles required by the most advanced technology for the silicon-based products, but found applications also in a number of industrial processes such as production of compact disks, hard disks and optical surface polishing. The characteristics of the abrasive material, their structure and size distribution typically play an important role in determining their removal properties. CLASSIZER™ ONE is the perfect tool for charactering both the size distribution, compactners of the mesopouros structure and the presence of solid contaminant or subvisible/submicron-scale aggregates.