ALKALINE-EARTH ALUMINOSILICATE GLASS FOR LAMP BULBS

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Composition of the glass, expressed in wt. % based on the oxide, is as follows : SiO2 55-64, Al2O3 13-18, B2O3 0-5.5, MgO 0-7, CaO 5-14, SrO 0-8, BaO 6-17, ZrO2 0-2, CeO2 0-0.3, TiO2 0-0.5, CoO 0.01-0.035, Fe2O3 0.005-0.05. Further formulations and additions are proposed.