GLASS COMPOSITION FOR LAMP, GLASS PART FOR LAMP, AND PROCESS FOR PRODUCING LAMP OR GLASS COMPOSITION FOR LAMP

摘要

A glass composition for lamp comprising, by weight percentage, 60 to 75% SiO<SUB>2</SUB>, 0.01 to 5.2% CeO<SUB>2</SUB>+Ce<SUB>2</SUB>O<SUB>3</SUB>, 0.01 to 5.2% SnO+SnO<SUB>2</SUB>, 0.5 to 6% Al<SUB>2</SUB>O<SUB>3</SUB>, 0 to 5% B<SUB>2</SUB>O<SUB>3</SUB>, 13 to 20% Li<SUB>2</SUB>O+Na<SUB>2</SUB>O+K<SUB>2</SUB>O, 0.5 to 5% MgO, 1 to 10% CaO, 0 to 10% SrO, 0 to 10% BaO, 0 to 10% ZnO, 0 to 0.2% Fe<SUB>2</SUB>O<SUB>3</SUB>+FeO and 0 to 1% TiO<SUB>2</SUB>. This provides a glass composition for lamp that does not contain lead and antimony and that has high ultraviolet screening capacity, ensuring less occurrence of glass initial staining and ultraviolet-caused staining.