Glass fiber is an inorganic non-metallic material with excellent performance, a wide variety of types, its main components are silica, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc., according to the amount of alkali content in the glass can be divided into alkali-free glass fiber, medium alkali glass fiber and high alkali glass fiber. The advantages are good insulation, strong heat resistance, good corrosion resistance, high mechanical strength, and the disadvantage is brittleness and poor wear resistance. It is made Fish measuring board of pyrophyllite, quartz sand, limestone, dolomite, borocalcite, boromagneite seven kinds of ore raw materials high-temperature solute drawing, winding, weaving and other processes, its monofilament diameter of 3 to 20 microns, equivalent to a hair filament 1/20, each bundle of fibrous filament is composed of several white heel monofilaments. The density of glass fiber is 2.4-2.75g/CM3, the softening point is 500-600 degrees, the boiling point is about 1000 °C, and the biggest feature of glass fiber as a reinforcing material for reinforcing plastics is that the tensile strength is large. The tensile strength is 6.3 to 6.9 g/d in the standard state and 5.4 to 5.8 g/d in the wet state. Good heat resistance, no effect on strength when the temperature reaches 300 °C. It has excellent electrical insulation, is a high-grade electrical insulation material, and is also used in thermal insulation materials and fireproof shielding materials. It is generally only corroded by concentrated alkali, hydrofluoric acid and concentrated phosphoric acid.

Glass fibers can be divided into continuous fibers, fixed length fibers and glass wool according to shape and length. Glass fibers can be divided into alkali-free, chemical-resistant, high-alkali, medium-alkali, high-strength, high-elastic modulus and alkali-resistant (alkali-resistant) glass fibers according to the glass composition. The main raw materials for the production of glass fiber are quartz sand, alumina and chlorophyllite, limestone, dolomite, boric acid, soda ash, glauber's salt, fluorite, etc., there are two production methods: one is to produce fibers directly from molten glass; The other is to make glass balls Surveyors tape measure or rods with a diameter of 20 mm and then make very fine fibers. Fine fibers with a diameter of 3-80 microns after reheating and remelting in various ways. Infinitely long fibers mechanically pulled by platinum alloy plates are called continuous glass fibers, often referred to as long fibers. Discontinuous fibers formed by rollers or air streams are called fixed-length glass fibers, often referred to as short fibers.