GLASS FOR MANUFACTURING FIBER GLASS Russian patent published in 2005 - IPC

FIELD: glass industry.

SUBSTANCE: invention relates to glass compositions, in particular, to compositions of boron-free alkali-free glass. Glass for manufacturing continuous glass fiber comprises the following components: SiO₂, Al₂O₃, CaO, MgO, TiO₂, R₂O (wherein R₂O means alkaline metal oxides Na₂O, K₂)) and ZrO₂ taken in the following ratio, wt.-%: SiO₂, 58.0-60.0; Al₂O₃, 12.0-14.0; CaO, 20.0-22.0; MgO, 3.0-5.0; TiO₂, 0.01-1.9; ZrO₂, 0.01-2.0; R₂O, up to 1.0. Proposed glass shows a vitrification point 740-770°C, a shift deformation point 830-860°C, and chemical stability - the 1-st hydrolytic class. Softening point of glass corresponding to viscosity value lg 7.6 is in the range 910-920°C. Invention provides the development of chemically and thermally stable, continuous glass fiber that can be used in reinforcement of glass-plastic articles, making roving and fabrics for different designation, among them, insulating as reinforcing materials for glass-plastic materials used in acid, neutral and alkaline media.

EFFECT: improved and valuable properties of glass.

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