en Research Paper Research Paper <div style="text-align: justify;"><em>This </em><em>paper focuses on the effect of ZrSiO₄/ZnO ratio on the properties of the glaze to be used on ceramic sanitary-ware. Structural and morphological characterization of these glazed ceramics were identified by XRD, SEM, FTIR and Raman Spectroscopy. Furthermore, thermal properties were determined by DTA and TG techniques. Besides, flexural strength, Vickers Microhardness, whiteness and chemical resistance were investigated experimentally. XRD analysis showed that the zircon and quartz were the crystalline phases, zircon was also </em><em>precipitated </em><em>into</em><em> the glaze layer during firing</em><em>. It was found that an increase of the ZrSiO₄/ZnO </em><em>ratio </em><em>part weights from 3.85 to 67, causes an increase in the zircon crystallite particle size from 203.90 to 288.86 &Aring;. From DTA, it was observed that by increasing ZrSiO₄/ZnO ratio, the crystallization </em><em>temperature of zircon</em> <em>decreases</em><em>.</em> <em>The glaze exhibits the highest whiteness value when the ratio of ZrSiO₄/ZnO becomes 12.60.</em></div> Glaze,Ceramic sanitary-ware,ZrSiO4/ZnO ratio,Vickers Microhardness,Whiteness. 104 115 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-2596-1&slc_lang=en&sid=1 Sa. Benkacem bekacemsamra@gmail.com 1800319475328460014662 1800319475328460014662 Yes University of Jijel Algeria K. Boudeghdegh kameltan@yahoo.com 1800319475328460014663 1800319475328460014663 No University of Mohammed Seddik Ben Yahia- Jijel, Algeria. F. Zehani zehanifouzia@yahoo.fr 1800319475328460014664 1800319475328460014664 No University of jijel Y. Belhocine Chimieskikda@gmail.com 1800319475328460014665 1800319475328460014665 No University of skikda Algeria