Glass fiber is an inorganic non-metallic material with excellent performance. It is made of glass ball or waste glass and is made by high-temperature melting, drawing and winding. The diameter of the monofilament is several micrometers to twenty. A few microns, equivalent to 1/20 to 1/5 of a hair strand, each bundle of fiber strands consists of hundreds or even thousands of monofilaments. Glass fiber has good insulation, heat resistance and high mechanical strength, but its wear resistance is poor. It is usually used as a reinforcing material, electrical insulating material and thermal insulation material in composite materials. The main components of glass fiber are silica, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc. According to the alkali content of the glass, it can be divided into alkali-free glass fiber (including 0% to 2% of sodium oxide). , is an aluminoborosilicate glass), medium-alkali glass fiber (containing 8% to 12% of sodium oxide, is a soda-calcium silicate glass containing or not containing boron) and high-alkali glass fiber (containing 13% of sodium oxide) Above, it is a soda lime silicate glass). According to different shapes and lengths, glass fiber can be divided into continuous fiber, fixed length fiber and glass wool. According to different components, glass fiber can be divided into alkali-free, high alkali, medium alkali, high strength, high elastic modulus and resistance. Alkali glass fiber, etc. The main raw materials for the production of glass fiber are quartz sand, alumina and pyrophyllite, limestone, dolomite, boric acid, soda ash, thenardite, fluorite and ground glass fiber. There are two main production methods: one is to directly make the molten glass into fibers, and the other is to first make the molten glass into a glass ball with a diameter of 20 mm, and then remelt it in various ways to make fine fibers having a diameter of 3 μm to 80 μm. . Specifically, a fiber made by a mechanical drawing method using a platinum alloy plate is called a continuous glass fiber, and is generally called a long fiber; a discontinuous fiber made of a roller or a gas stream is called a fixed length glass fiber, and is generally called a short fiber; Fine, short, floc-like fibers made by centrifugal force or high-speed airflow are called glass wool. Glass fiber can be processed into various forms of products, such as chopped strands, tapes, felts, plates, tubes, and the like. Glass for the production of glass fiber is different from glass for the production of other glass products. The glass components of the fiber that have been commercialized internationally are as follows: E-glass: also known as alkali-free glass, is a borosilicate glass. It is the most widely used glass fiber component for glass fiber. It has good electrical insulation and mechanical properties and is commonly used in the production of glass for electrical insulation. Fiberglass for fiber and glass reinforced plastic. However, this glass is easily attacked by inorganic acids and is not suitable for use in an acidic environment. C-glass: also known as medium alkali glass, good chemical resistance, especially acid resistance is better than alkali-free glass, but the electrical properties are poor, the mechanical strength is lower than the alkali-free glass fiber 10% to 20%, usually the foreign alkali Glass fiber contains a certain amount of boron trioxide, while China's medium alkali glass fiber is completely free of boron. In addition, glass fiber rods are also used to strengthen asphalt roofing materials. China's medium alkali glass fiber accounts for 60% of glass fiber production. AR-glass fiber: also known as alkali-resistant glass fiber, mainly developed to enhance cement properties. A-glass: also known as high alkali glass, is a typical sodium silicate glass, which is rarely used to produce glass fiber due to poor water resistance. E-CR glass: It is a modified boron-free alkali-free glass for the production of glass fiber with good acid resistance and water resistance. Its water resistance is 7 times to 8 times stronger than that of alkali-free glass fiber. Glass fiber is good, it is a new variety developed for underground pipelines. D-glass: also known as low dielectric glass for the production of low dielectric glass fibers with high dielectric strength. High-strength glass fiber: high-strength, high-modulus, single-fiber tensile strength is 2800MPa, which is about 1.25 times of tensile strength of alkali-free glass fiber; elastic modulus is 86,000MPa, which is higher than E-glass fiber. Alkali-free glass fiber: completely free of boron, can effectively reduce environmental pollution, but its electrical insulation properties and mechanical properties are similar to the traditional E-glass. In addition, there is a glass fiber with double glass composition and fluorine-free glass fiber, etc., the former has been used to produce glass wool, and the latter is an environmentally-friendly non-alkali glass fiber. 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