The main raw materials used for the production of electrical porcelain insulators are feldspar, clay and quartz. China clay (Bikaner, Rajasthan), ball clay (United Kingdom), china clay (Rajmahal, Jharkhand), local china clay (Birbhum, West Bengal), quartz powder (Hyderabad, Telengana) and feldspar powder (Hyderabad, Telengana) were selected as raw materials for the formulation of …