It is a kind of inorganic nonmetallic material with excellent performance. It has a great variety of properties, good insulation, good heat resistance, good corrosion resistance and high mechanical strength. However, the disadvantages are brittle and poor wear resistance. It is a glass ball or waste glass as raw materials by high temperature melting system, wire drawing, winding, weaving and other manufacturing processes, its monofilament diameter of a few microns to 20 meters microns, the equivalent of a human hair 1/20-1/5, each bundle fiber original SiDou consists of hundreds or even thousands of root monofilament. Glass fiber is usually used as reinforcing material in composite materials, electrical insulation materials and adiabatic insulation materials, electric roadbed and other areas of national economy.