COMPOSITION OF ELECTRONIC-GRADE FIBREGLASS, AS WELL AS FIBREGLASS AND ELECTRONIC TEXTILE MADE THEREFROM Russian patent published in 2022 - IPC C03C13/02 C03C3/87 C03C3/91 

FIELD: textiles.

SUBSTANCE: proposed in the invention is a composition of electronic-grade fibreglass, as well as fibreglass and electronic textile made therefrom, intended for use as a base material for printed circuit boards. Proposed composition of electronic-grade fibreglass contains the following components, expressed as percentages by weight: 54.2 to 60 SiO₂, 11 to 17.5 Al₂O₃, 0.7 to 4.5 B₂O₃, 18 to 23.8 CaO, 1 to 5.5 MgO, 24.8 or less CaO+MgO, less than 1 Na₂O+K₂O+Li₂O, 0.05 to 0.8 TiO₂, 0.05 to 0.7 Fe₂O₃, and 0.01 to 1.2 F₂; wherein the ratio of mass percentages C1=SiO₂/(RO+R₂O) is greater than or equal to 2.20, the ratio of mass percentages K₂O/Na₂O is greater than or equal to 0.75, and the total mass percentage of the above components is greater than or equal to 98.5%.

EFFECT: proposed composition has an advantage consisting in a low cost and high corrosion resistance; it can improve the electrical properties, in particular, dielectric properties of glass, as well as enhance the mechanical properties, water impermeability and acid resistance of glass; such a composition can also significantly reduce the evaporation of raw materials and minimise the corrosion of fire-resistant materials; therefore, the proposed composition is suitable for large-scale production in tank furnaces.

18 cl, 9 ex, 6 tbl