STAINED GLASS Russian patent published in 1996 - IPC

FIELD: glass industry. SUBSTANCE: stained glass has, wt.-%: silicon oxide (SiO₂) 65.00-72.72; aluminium oxide (Al₂O₃) 3.03-8.07; sodium oxide (Na₂O) 12.11-17.00; calcium oxide (CaO) 1.01-5.05; fluorine (F¹) 1.00-4.04; magnesium oxide (MgO) 0.001-4.06; ferric oxide (Fe₂O₃) 0.01-1.01; sulfur (S^-6) 0.0001-1.01; potassium oxide (K₂O,) 0.0001-2.02; calcium fluoride (CaF₂) 0.5-4.04; ferrous sulfide (FeS) 0.012-1.52 and at least one component from the group: cobalt oxide (Co₂O₃) 0.005-0.20; copper oxide (CuO) 0.005-0.50; cerium oxide (Ce₂O₃) 0.001-0.50; manganese oxide (MnO) 0.005-0.50; nickel oxide (NiO) 0.005-0.25, and selenium (Se) 0.005-0.10. Ratio ΣFe₂O₃+S^-2/FeS = 0.67-1.83, ray transmission at wavelength 560-600 nm is 2-14.5%. Glass is used for light-filter making. EFFECT: enhanced quality of glass. 2 tbl