FIELD: building materials. SUBSTANCE: glass for fiberglass has, wt.-%: aluminium oxide (Al2O3) 12-23; calcium oxide (CaO) 5-14; sodium oxide (Na2O) 12.5-19; zirconium oxide (ZrO2) 0.1-0.5, and silicon oxide (SiO2) - the rest. Glass can contain additionally magnesium oxide (MgO) 0.5-11 wt.-%. Glass strength after treatment in alkaline solution is 1500-1650 MPa. Glass is used for cement material reinforcement. EFFECT: enhanced quality of glass. 2 cl, 1 tbl
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