Melting point: Glass is a type of amorphous material with no fixed melting point. It is generally believed that its softening point is between 500 and 750 ℃

Boiling point: about 1000 ℃

Density: 2.4-2.76 g/cm

When glass fiber is used as a reinforcing material for reinforced plastics, its characteristic is high tensile strength. The tensile strength is 6.3-6.9 g/d in the standard state and 5.4-5.8 g/d in the wet state. Good heat resistance, with no effect on strength when the temperature reaches 300 ℃. It has excellent electrical insulation properties, is an electrical insulation material, and is also used for insulation materials and fire shielding materials. Generally, it is only corroded by concentrated alkali, hydrofluoric acid, and concentrated phosphoric acid.