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Also called medium alkali glass, it is characterized by chemical resistance, especially acid resistance is better than alkali-free glass, but electrical performance is poor, mechanical strength is lower than alkali-free glass fiber $number, usually foreign alkali glass fiber contains a certain number of boron trioxide, and China's alkali glass fiber is completely boron-free. In foreign countries, the alkali glass fiber is only used for the production of corrosion-resistant glass fiber products, such as glass fiber surface felt, etc. also used to enhance asphalt roofing materials, but in our country alkali glass fiber occupies more than half of the glass fiber production (60%), widely used in FRP reinforcement and filter fabric, cloth and other production, because its price is lower than the alkali-free glass fiber and has a strong competitiveness.