Clear glass with a gloss, a small bulk density, good expansion, high refractoriness, strong chemical stability. For the chemical industry,construction, metallurgy, petroleum, electric power, cast and other departmentsfor use as insulation, and agricultural improver productionItemSiO2Al2O3TiO2CaOMgOFe2O3FeOK2ONa2OMnOH2OContent72.3612.760.940.600.103.360.304.493.340.172.25