The need of electrical energy is raised by the development of industry and that required to transportation of energy to the more distant points. All these developments reveal the need of cheaper insulator production and the need of enhancement of insulators technical specifications and mechanical resistance against the increasing mains voltage and external factors. In the study, three different prescriptions, contain 0.1 %, 0.3 % and 1% H3BO3 additive, were prepared. Then, prepared samples were shaped on vacuum presses in the laboratory. After samples were dried, they were sintered at 1255 ºC for 2 hours in air. Particle size distribution, dry refinement, fuchsine and bending three point tests were applied to the samples. Characterizations of microstructure were performed by XRD, SEM and EDS analyses. At the end of the experimental studies, it was seen that depending on additive percentage, the reduction of particle size distribution is up to 0.3% and particle size is increasing with an increase in additive ratio. The maximum dry reduction amount was seen on the sample that contains 1 % boric acid. In general, it was determined that the sample, which contains 0.3 % boric acid, gives closer results to operation conditions. Therefore, it was observed that the boric acid could be an alternative raw material source, if it is incorporate into electro-ceramic at a certain ratio.