GLASS FOR GLASS-CRYSTALLINE MATERIAL Russian patent published in 1996 - IPC

FIELD: glass industry, silicate ceramics. SUBSTANCE: glass has, wt.-%: silicon oxide (SiO₂) 48.5-52.0; aluminium oxide (Al₂O₃) 10.0-14.5; boron oxide (B₂O₃) 0.5-2.0; magnesium oxide (MgO) 7-9; calcium oxide (CaO) 10-11; zinc oxide (ZnO) 1-2; titanium oxide (TiO₂) 0.1-0.5; sodium oxide (Na₂O) 2.2-2.8; potassium oxide (K₂O) 1-2; zirconium oxide (ZrO₂) 0.5-5.0; ferric oxide (Fe₂O₃) 6.5-7.5; ferrous oxide (FeO) 2.5-4.3; chrome oxide (Cr₂O₃) 0.5-1.5; manganese oxide (MnO) 0.2-0.5, and phosphorus pentoxide (P₂O₅.) 0.3-0.5. Properties: chemical stability of material in hydrochloric acid (weight loss, mg/дм²) is 0.35-0.51; microhardness at 100 g loading, "ГПА" is 10.2-10.9. Material is used in textile, chemical, electric engineering industries. EFFECT: enhanced quality of glass. 2 tbl