An insulator, also called a dielectric, is a material that resists the flow of electric current. Ceramic porcelain insulators are widely used in electrical applications such as power transmission and distribution. These materials are usually operated in electrical systems because of their good electrical, mechanical, and thermal characteristics under unfavorable environmental effect. The present study shows the effect of alumina on physical and mechanical properties of porcelain bodies over high temperature. A group of three samples A1 , A2 , and A3 of varying composition were prepared with the help of hydraulic press machine. Different instruments like Particle size analyzer, Universal testing machine, Porosity testing machine, etc. were used for determining the physical and mechanical properties. Chemical analysis of fired body was performed by using Gravimetric process in which % of silica, alumina, Fe2 O3 , TiO2 , CaO, and MgO were found. Properties like total shrinkage, bulk density, water absorption, porosity, extrusion moisture, and bending strength were found by physical and mechanical testing. Maximum bending strength was found for sample A1 i.e., 82.614 MPa of high alumina content with total shrinkage 15.13%, bulk density 2.686 gm/cc, zero water absorption and porosity. The lowest bending strength was found for sample A3 i.e., 55.245 MPa of lowest alumina content with total shrinkage 17.13%, bulk density 2.489 gm/cc, zero water absorption and porosity. This study shows that with varying composition of material, physical and mechanical properties of insulator also change. For the highest alumina sample strength was found to be maximum.

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