This study was carried out to prepare a porcelain samples, which can be used as an electrical insulator. The raw materials used for the preparation are kaolin Duakhla, Arudhma Sand glass and Potash feldspar with weight percentage (45%, 30%, 25%) respectively. A chemical treatment was performed on kaolin Duakhla, Arudhma Sand glass to remove all the impurities. The effect of the washing by HCl acid (chemical treatment) was examined by IR Tech. The study divided into seven groups. Relating to the concentration of electrolyte solution which is consisting of (NaCO3 & NaSiO3) as a ratio (2:1), and for fixed percentage of mineralizer (2%ZnO). The concentrations of electrolyte which were added to these groups are (1%, 0.7%, 0.5%, 0.2%, and 0.1%). Samples of each group have been prepared, and then each sample was pressed, then after that these samples are dried and sintered for different temperatures (1250, 1300, 1350 oC). Dielectric measurement (Dielectric Constant& Dielectric loss index) were carried out for these pressed samples, also Physical properties “Thermal conductivity” and mechanical properties “Compression strength” were measured for these samples. The results of these measurements for samples sintered at 1350oC are found to have a stable change at the range (0.1–0.2%) of concentration of electrolyte solution. While there is a change in the results of thermal conductivity in the concentration range (0.2–0.5%) of electrolyte solution. And the values of compression strength is found to be high at 0.5% concentration of electrolyte solution. Therefore we should select the best concentration of electrolyte solution, to get the optimum properties which would agree with practical results and the standard properties for the attentive in other countries of the world. Then, can regarde the (0.2%) concentration of electrolyte solution is the optimum value that can be used in the industry of the electrical insulators.