GLASS FOR GLASS CERAMIC MATERIAL Russian patent published in 1995 - IPC

FIELD: industry of building materials. SUBSTANCE: glass has, wt.-%: silicon oxide (SiO₂) 47.9-64.7; aluminium oxide (Al₂O₃) 4.1-11.2; ferric oxide (Fe₂O₃) 0.2-0.9; calcium oxide (CaO) 20.9-32.2; magnesium oxide (MgO) 2.9-6.2; sodium oxide (Na₂O) 2.9-6.5; phosphorus pentoxide (P₂O₅) 0.1-1; fluorine (F) 0.1-1.2; sulfur trioxide (SO₃) 0.2-0.5; manganese oxide (MnO) 0.1-0.3; potassium oxide (K₂O) 0.1-1.3; titanium oxide (TiO₂) 0.1-0.3. Thermal stability of material prepared is 130-180 C, impact resistance is 120-130 Hxcm. EFFECT: enhanced quality of glass ceramic material proposed. 2 tbl