Epoxy resin standoff insulator is an essential insulator for the safety of distribution equipment such as distribution cabinet, circuit breaker, switch cabinet and isolating switch. It supports power infrastructure at the end. In the past, insulators were made of ceramics. Since 1974, Lichang Industry Co., Ltd. of Japan has introduced the pressure coagulation method with good quality consistency to manufacture indoor insulators with epoxy resin. The twists and turns on the insulator surface are to extend the insulation distance. The twists and turns of epoxy resin insulators can be much deeper. Therefore, the weight and volume of epoxy resin insulators with the same voltage are much smaller than those of ceramic insulators.