It is made of domestic top-class glass fiber filament raw materials, bonded by epoxy resin and heated and pressurized to form a kit. It has high mechanical performance at medium temperature and stable electrical performance at high temperature. The high-insulation structural parts for machinery, electrical appliances and electronics produced by it have high mechanical and dielectric properties, good heat resistance and moisture resistance, heat resistance class F (155 degrees), and are widely used in wind power generation field.