What is the basic composition of fiberglass?

Fiberglass is a fiber or filament made of silicate melt. Its main components include silica, alumina, calcium oxide, boron oxide, magnesium oxide and sodium oxide. Made through high-temperature melting, drawing, winding and other processes, it has the characteristics of insulation, heat resistance, corrosion resistance and high mechanical strength. Fiberglass composite materials are a combination of fiberglass materials and engineering plastics.