LITHIUM-FREE GLASS WITH HIGHER MODULUS Russian patent published in 2015 - IPC C03C3/87 

FIELD: chemistry.

SUBSTANCE: invention relates to glass compositions for obtaining fibreglass. An R-glass composition, including SiO₂ in an amount of 59.0-60.93 wt %, Al₂O₃ in an amount of 14.5-20.5 wt %, CaO in an amount of 11.0-16.0 wt %, MgO in an amount of 5.5-11.5 wt %, Na₂O in an amount of 0.0-4.0 wt %, TiO₂ in an amount of 0.0-2.0 wt %, B₂O₃ in an amount of approximately 0.0-3.0 wt %, K₂O, Fe₂O₃, ZrO₂ and fluorine, each in an amount of approximately 0.0-1.0 wt %, as well as SrO and ZnO, each in an amount of approximately 0.0-2.0 wt %.

EFFECT: obtaining the higher Young modulus, low temperature of moulding and sufficiently large difference between the moulding temperature and the liquidus temperature.

20 cl, 10 tbl