Glass is an inorganic material that has been melted at high temperature (above 800 ℃, daily glass is generally melted at 1100 ℃.), and will not undergo chemical changes below the softening point temperature. Above the softening point temperature, it will only soften, melt or decompose without burning.

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.