The influence of the grain size distribution of raw materials on the selected surface properties of sanitary glazes

Glazes in significant way influence on most of the final properties of ceramic ware, mainly on surface parameters as colour, glossy or roughness. Usually, these properties has been changed by chemical composition and firing parameters. The results of presented works show, there is a possibility of improvement of surface proprieties by the selective milling and selection of the grain size of group of raw materials. It was shown, that in case of the sanitary glazes, an adequate selection of the grain size of quartz, feldspars, zirconium silicate and rest of raw materials, leads to improvement of whiteness and glossy as well as decreasing of roughness of surface.