According to the shape and length, glass fiber can be divided into continuous fiber, fixed-length fiber and glass wool; according to the glass composition, it can be divided into alkali-free, chemical resistant, high alkali, medium alkali, high strength, high elastic modulus and alkali resistant glass Fiber etc.
The main raw materials for glass fiber production are: quartz sand, alumina and pyrophyllite, limestone, dolomite, boric acid, soda ash, mirabilite, fluorite, etc. The production methods are roughly divided into two categories: one is to directly make molten glass into fibers; the other is to first make molten glass into glass balls or rods with a diameter of 20mm, and then heat and remelt them in various ways to make them with a diameter of 3~ 80μm very fine fiber. The infinitely long fiber drawn by the mechanical drawing method through the platinum alloy plate is called continuous glass fiber, commonly known as long fiber. Discontinuous fibers made by rollers or airflow are called fixed-length glass fibers, or short fibers. Thin, short, flocculent fibers made by centrifugal force or high-speed airflow are called glass wool. The glass fiber can be processed into various forms of products, such as yarn, untwisted roving, chopped strand, cloth, tape, felt, plate, tube, etc.
Glass fibers are divided into different grades according to their composition, properties and uses. According to standard grade regulations (see table), E grade glass fiber is the most commonly used and widely used in electrical insulation materials; S grade is a special fiber, although the output is small, but it is very important, because of its super strength, it is mainly used for military defense, such as Bulletproof boxes, etc.; Class C is more chemically resistant than Class E, used for battery separators and chemical filters; Class A is alkaline glass fiber, used for the production of reinforcement materials.
Glass fiber-the main component The main components are silica, alumina, calcium oxide, boron oxide, magnesium oxide, sodium oxide, etc. According to the amount of alkali in the glass, it can be divided into alkali-free glass fiber (sodium oxide 0% ~ 2%, aluminoborosilicate glass), medium alkali glass fiber (sodium oxide 8%-12%, boron-containing or boron-free soda lime silicate glass) and high alkali glass fiber (sodium oxide 13% The above is a soda lime silicate glass).