DECORATIVE GLASS Russian patent published in 2000 - IPC

FIELD: glass industry, more particularly decorative multicolored glasses for manufacture of facing and artistic products. SUBSTANCE: decorative glass comprises, wt. %: SiO₂, 61.05-61.85; Al₂O₃, 2.10-3.73; Fe₂O₃, 0.32-6.83; MgO, 0.02-11.37; CaO, 18.86- 33.48; Na₂O, 0.32-2.10; K₂O, 0.50-1.09; P₂O₅, 0.42-0.54; TiO₂, 0.10-0.50. Normative mineral composition of glass meets requirements of pyroxene-quartz feldspar system in which pyroxene content is 64.62-73.93 wt.%, and ratio of quartz and feldspars is 0.78-1.52: 1. In order to prepare decorative glass, use is made of blend comprising wt. %: nepheline-feldspar rocks (nepheline or permatite), 6.45- 7.52; magnesian calcium rocks (diopside or melylitite or chalk), 46.87-79.13; quartz, 13.35-105.88; and apatite (more than 100%), 1.00. EFFECT: lower annealing temperature and increased acid resistance and high decorative properties of the material. 2 cl, 3 tbl