DECORATIVE GLASS Russian patent published in 2003 - IPC

FIELD: glass industry. SUBSTANCE: invention relates to composites of decorative glasses and can be used for preparing decorative facing materials and jewelry articles. Decorative glass comprises the following composition, wt. -%: B₂O₃,, 35.125-49.735; P₂O_5,, 8.300-20.000; SiO₂, 2.900-7.900; TiO₂, 2.850-5.140; FeO, 0.010- -0.930; CaO, 15.700-17.100; MgO, 1.100-8.000; MnO, 0.150-3.300; Al₂O₃, 4.000-6.000; Fe₂O₃, 1.000-3.000; Na₂O, 0.100-0.200; K₂O, 0.430-0.860; B₂O₃, 0.010-2.000; P₂O₅, 0.005-0.010; ZrO₂, 0.001-0.005; La₂O₃, 0.002-0.010. Invention provides decrease of boiling point temperature, increase of microhardness and mechanical strength values, expanding color spectrum, utilization of waste in metallurgy and mining concentrating plants based on addition of oxides Pr₂O₃, Nd₂O₃ and rare-earth elements oxides. EFFECT: improved properties of glass. 1 tbl, 3 ex