We commonly see various types of glass in our daily life, but glass fiber is seldom in contact with it. The main reason is that glass fiber is generally used as a base material. For example, we use reinforced mesh for wall putty, or our cutting sheets. The inside is There are fiberglass mesh or wind turbine blades, so it is difficult to see ready-made fiberglass. 
Glass fiber is an inorganic non-metallic material with excellent performance. It is mainly made of: pyrophyllite, quartz sand, kaolin, dolomite, limestone, quicklime and other raw materials. After a certain amount of configuration, it is melted at high temperature, drawn, wound, and woven. Made of cloth and other processes, it is a reinforcing material in composite materials, electrical insulation materials and thermal insulation and thermal insulation materials.
Compared with other organic fiber materials, glass fiber materials have the following obvious characteristics:
1. High tensile strength and small elongation (3%)
2. High elastic coefficient and good rigidity.
3. It is an inorganic fiber, non-flammable and has good chemical resistance.
4. Low water absorption
5. Good adhesion to resin
6. High cost performance and cheap.
Of course, fiberglass is also glass, so it also has some disadvantages, such as brittleness, poor resistance to folding, and poor wear resistance.
In the industry, there are many classifications of glass fiber, but the commonly used ones are as follows:
1. Alkali-free glass fiber: It is called E glass fiber. Its alkali metal content is less than 0.8%. Its chemical stability, electrical insulation performance and strength are very good.
2. Medium-alkali glass fiber: The alkali metal content is mainly 11.9-16.4%. Due to the high alkali metal content, it cannot be used as an insulating material.
3. High-alkali glass fiber: with an alkali metal content of not less than 15%, it can be used as waterproof and moisture-proof materials such as battery separators, pipe wrapping cloths and felt sheets.
Or there are new classifications under special use requirements. Such as high-strength glass fiber, high-temperature-resistant glass fiber, acid-resistant glass fiber, low-dielectric glass fiber, conductive fiber, etc.
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