Ceramic Electrical Insulator body was prepared using Iraqi local materials. These are kaolin Duakhla, Arudhuma Sand glass and potash feldspar with weight percentage (45%, 25%,30%)respectively, of controlled particle size distribution. Chemical and Heat treatment was performed on kaolin duakhla, Arudhuma Sand glass as a first step. Followed by milling, classification, mixing, forming and firing, through the process of mixing electrolyte solution and mineralizer were added at different

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... on for electrolyte solution, (1%, 0.7%, 0.5%, 0.2%, and 0.1%). The electrolyte solution was prepared by mixing sodium carbonate and sodium silicate by (2:1) ratio, while the mineralizer, Zinc Oxide, was added at fixed weight percentage. The measurements were under taken on disk sample burnt at firing temperatures of (1250, 1300, 1350) o C. The Conclusion behind these study were the optimum properties obtained , by adding 2% weigh percentage of zinc oxide, and using (0.2 -0.5)electrolyte solution concentration, gives good mechanical , thermal and dielectric properties. These results related in some what, to the cation exchange property of local clay which controls the surface charge of clay.