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 non-alkali, chemical resistance, high alkali, medium alkali, high strength, high elastic modulus and alkali resistance ( Alkali resistance) 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, mirabilite, fluorite, etc. The production methods can be roughly divided into two categories: one is to make molten glass directly 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.
Glass fibers are divided into different levels according to their composition, properties and uses. According to standard grade regulations, E grade glass fiber is the most commonly used and widely used in electrical insulation materials; S grade is a special fiber.
