Main components and material properties of glass fiber
Dec 11, 2022| Material properties
Melting point: glass is amorphous and has no fixed melting point. It is generally believed that its softening point is 500~750 ℃
Boiling point: about 1000 ℃
Density: 2.4~2.76 g/cm3
When glass fiber is used as a reinforcing material of reinforced plastics, its biggest feature is its high tensile strength. The tensile strength is 6.3~6.9 g/d in standard state and 5.4~5.8 g/d in wet state. It has good heat resistance and has no effect on the strength when the temperature reaches 300 ℃. With excellent electrical insulation, it is a high-grade electrical insulation material, and also used for thermal insulation materials and fireproof shielding materials. Generally, it is only corroded by concentrated alkali, hydrofluoric acid and concentrated phosphoric acid.
Main components
Its main components are silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc. According to the alkali content in the glass, it can be divided into alkali free glass fiber (sodium oxide 0%~2%, belonging to aluminum borosilicate glass), medium alkali glass fiber (sodium oxide 8%~12%, belonging to sodium calcium silicate glass with boron or without boron) and high alkali glass fiber (sodium oxide more than 13%, belonging to sodium calcium silicate glass).