Transparent, opal and crystalline glass compsn. - contg. silica, lime alumina, sodium oxide and magnesia, opt iron oxide, sulphide ions and other oxides

摘要

Glass contg. by wt. 71-80% SiO2, 15-30% CaO, 1-4.5% Al2O3, 0.5-5% Na2O and 2-8% MgO can be used for prodn. of opt. coloured opal glass, colourless transparent and crystalline glass. Pref. glass may also contain 0.2-1% Fe2O3 and S= and 0.03-3% of no more than 3 out of CoO, MnO2, Cr2O3, NiO and FeO. Uses include plate- and ornamental glass for domestic and industrial buildings and agriculture.