Patent ID: 6528444
Filing Date: 2003-03-04
Classification: C03C

Abstract:
A stem for lamps including glass which has a composition consisting essentially of, expressed in percentages by weight:SiO2 65-75, Al2O3 0.5-4, Na2O 1-7, K2O 1-7, Li2O 0-2, MgO 0.5-5, CaO 1-8, SrO 2.5-7, BaO 4-6.5, B2O3 0-3, Sb2O3 0-1, Fe2O3 0-0.2, TiO2 0-1, CeO2 0-1; wherein the total amount of Na2O, K2O and Li2O is not more than 13%.