Fiberglass is an excellent inorganic non-metallic material with a wide variety of properties. Its advantages include good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, but its disadvantages are brittleness and poor wear resistance. It is made from six types of ores, including pyrophyllite, quartz sand, limestone, dolomite, borosilicate, and boromagnesite, through high-temperature melting, wire drawing, winding, weaving, and other processes. The diameter of its single filament ranges from a few microns to over twenty microns, equivalent to 1/20-1/5 of a hair thread. Each bundle of fiber precursor is composed of hundreds or even thousands of single filaments. Glass fiber is commonly used as a reinforcing material in composite materials, electrical insulation materials, thermal insulation materials, circuit substrates, and other fields of the national economy.