HIGH-MODULUS FIBERGLASS COMPOSITION, GLASS FIBER AND COMPOSITE MATERIAL THEREFROM Russian patent published in 2020 - IPC C03C13/00 

FIELD: glass industry; production of composite materials.

SUBSTANCE: invention relates to a composition for producing high-modulus fiber, which can be used for reinforcing resins and producing composite materials. Said composition is especially suitable for production in a bathroom furnace of high-modulus glass fiber with low degree of bubbling and contains the following components, wt %: 53–68 SiO₂, 13–24.5 Al₂O₃, 0.1–8 Y₂O₃+La₂O₃, 0.05–1.7La₂O₃, more than 12 and less than or equal to 14 MgO, from more than 12 to 23 CaO+MgO+SrO, less than 2 Li₂O+Na₂O+K₂O and less than 1.5 Fe₂O₃, at that the weight percentage ratio of Y₂O₃/(Y₂O₃+La₂O₃) is more than 0.5.

EFFECT: said composition provides a significant increase in the modulus of elasticity of glass, a substantial decrease in liquidus temperature and molding temperature of glass and other equal conditions provides a significant reduction in the rate of crystallisation and degree of glass bubbling.

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