Using high-quality glass fiber cloth, epoxy resin, phthalic anhydride and 306, fiberglass cloth and curing agent of several insulating material, high temperature and then after the first initial setting in the mold, and then remove the mold, after the second high-temperature polished, a coarse grinding, fine grinding twice, and then painting made into other fiberglass products, beautiful appearance, compact structure, easy operation, with excellent mechanical and electrical properties, suitable for a variety of high-pressure conditions of use, good insulation properties safe