OPAQUE GLASS Russian patent published in 1995 - IPC

FIELD: glass industry. SUBSTANCE: opaque glass has, wt.-% silicon oxide (SiO₂;) 55-71; aluminium oxide (Al₂O₃;) 3-8; sodium oxide (Nq₂O;) 10-17; calcium oxide (CaO) 2-12; magnesium oxide (MgO) 0.01-5.00; fluorine (F) 0.10-3.0; phosphorus pentoxide (P₂O₅;) 0.50-4.0; ferric oxide (Fe₂O₃;) 0.01-2.00; sulfur trioxide (SO₃) 0.1-1.0, and at least one component from the group: cobalt oxide (CoO) 0.005-0.10; copper oxide (CuO) 0.005-0.50; chrome oxide (Cr₂O₃;) 0.001-0.50; manganese oxide (MnO) 0.005-0.50; nickel oxide (NiO) 0.05-0.50, and selenium (Se) 0.005-0.10. Glass properties: softening point of glass is 820-850 C. Glass is used for making architectural-artistic members. EFFECT: enhanced quality of glass. 2 tbl