GLASS FIBRE COMPOSITION AND GLASS FIBRE AND COMPOSITE MATERIAL BASED THEREON Russian patent published in 2020 - IPC C03C13/00 

FIELD: optics.

SUBSTANCE: present invention relates to glass fibre. In particular, disclosed is a composition for producing glass fibre, containing the following components with corresponding percentage content by weight: SiO₂: from 57.4 to 60.9 %; Al₂O₃: greater than 17 % and less than or equal to 19.8 %; MgO: greater than 9 % and less than or equal to 12.8 %; CaO: from 6.4 to 10 %; SrO: from 0 to 1.6 %; Na₂O + K₂O: 0.1 to 1.1 %; Fe₂O₃: from 0.05 to 1 %; TiO₂: less than 0.8 %; and SiO₂ + Al₂O₃: less than or equal to 79.4 %. Total weight percentage of said components in the composition is more than 99 %. Ratio of weight percentage concentrations of Al₂O₃ + MgO to SiO₂ ranges from 0.43 to 0.56, ratio of weight percentage concentrations of CaO + MgO to SiO₂ + Al₂O₃ is more than 0.205, and the ratio of weight percent concentrations C3 = (MgO + SrO) / CaO ranges from 0.938 to 1.6.

EFFECT: disclosed composition can significantly increase the glass module, effectively reduce glass crystallisation rate, provide the desired temperature range (ΔT) for moulding the fibre and improved clarification of molten glass, which thus makes it particularly suitable for producing high-quality glass fibre using furnaces with refractory lining.

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