GLASS Russian patent published in 1994 - IPC

FIELD: building. SUBSTANCE: glass has, wt.-%: silicon oxide (52,0-54,0 БФ SiO₂) 52-54; aluminium oxide (9,0-10,0 БФ Al₂O₃) 9-10; ferric (III) oxide (Fe₂O₃) 11-12; ferrous (II) oxide (FeO) 1.2-2.0; calcium oxide (CaO) 10-11; magnesium oxide (MgO) 4-5; sodium oxide (1,5-2,0 БФ Na₂O) 1.5-2.0; potassium oxide (3,0-4,0 БФ K₂O) 3-4; titanium oxide (0,5-0,7 БФ TiO₂) 0.5-0.7; chrome oxide (1,8-3,0 БФ Cr₂O₃) 1.8-3.0, and nickel oxide (0,5-1,3 БФ Ni₂O₃) 0.50-1.3. Glass properties: microhardness is 840-850 kg/mm², abradability is 0,015-0,02 g/cm². EFFECT: enhanced quality of glass. 1 tbl