Glass fiber has higher temperature resistance, incombustibility, corrosion resistance, heat insulation, sound insulation, high tensile strength and good electrical insulation than organic fiber. However, it is brittle and has poor wear resistance. The glass fiber used to manufacture reinforced plastics or reinforced rubber, as a reinforcing material, has the following characteristics. These characteristics make the use of glass fiber far more extensive than other types of fibers, and the development speed is also far ahead.