Porcelain is a ceramic dielectric. This was the first ceramic material to be used by the electrical industry. Porcelain is impervious to moisture, resist atmospheric conduction attacks and when glazed, surface become too smooth which is easily cleaned. The basic composition of porcelain is 50% clay, 25% feldspar and 25% flint. The quality of the final product and its degree of vitrification depends upon the fineness of grinding, the method of forming and the annealing temperature. By varying the proportions of three main ingredients it is possible to emphasize certain properties such as heat, shock resistance and dielectric strength or mechanical strength. We can broadly classify porcelain materials into two: Impervious high tension porcelain and porous low tension porcelain.
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