ELECTRONIC-GRADE GLASS FIBER COMPOSITION, GLASS FIBER AND ELECTRONIC CLOTH THEREOF

摘要

The present invention provides an electronic-grade glass fiber composition, and a glass fiber and an electronic fabric thereof. The electronic-grade glass fiber composition comprises the following components expressed as percentage amounts by weight: 54.2-60% SiO₂, 11-17.5% Al₂O₃, 0.7-4.5% B₂O₃, 18-23.8% CaO, 1-5.5% MgO, less than or equal to 24.8% CaO+MgO, less than 1% Na₂O+K₂O+Li₂O, 0.05-0.8% TiO₂, 0.05-0.7% Fe₂O₃ and 0.01-1.2% F₂; wherein, the weight percentage ratio C1= SiO₂/(RO+R₂O) is greater than or equal to 2.20, and the total weight percentage of the above components is greater than or equal to 98.5%. The composition has the advantage of low cost and high corrosion resistance. It can improve the electrical properties, especially dielectric properties, of the glass, and increase the mechanical properties, water resistance and acid resistance of the glass; it can also significantly reduce the cost of raw materials, significantly decrease the volatilization of raw materials, and minimize the corrosion of refractories. Thus, the composition is suitable for large-scale tank furnace production.