Abstract <p>In this research, the process is presented to remove the solubility of raw materials in water instead of frittic process. Therefore a suitable glaze for single fast firing floor tile consisted of 80 wt % raw glaze and 20 wt % frit was considered. An initial batch of frittic glaze including silicate, calcite, soda, and acid boric becomes a low soluble compound first by melting and quenching in water (frittic process) and also by firing at different temperatures that firing causes the formation of low solubility phase. Then these glazes mixed with 80 wt % raw glaze. Glazes slip applied on the dried floor tile bodies and then fired in fast firing kiln. Properties of glazes (thermal expansion coefficient, <i>T</i>_g, micro-hardness) were compared. Also by X-ray diffraction analysis and solubility analysis proved low soluble phases formed in glaze by firing initial batch of frit at 800°C.</p>