Briefly describe the classification and use of glass fiber
    According to shape and length, glass fiber can be divided into continuous fiber, fixed-length fiber and glass wool; according to glass composition, it can be divided into alkali-free, chemical-resistant, medium-alkali, high-strength, high-elastic-modulus and alkali-resistant (alkali-resistant) fiberglass, 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 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 20 mm, and then heat and remelt them in various ways to make glass balls or rods with a diameter of 3 to 3 mm. 80μm very fine fibers. The infinitely long fibers drawn by the mechanical drawing method of platinum alloy plates are called continuous glass fibers, commonly known as long fibers. Discontinuous fibers made by rollers or air flow, called fixed-length glass fibers, commonly known as chopped strands fiberglass.