GLASS COMPOSITION AND GLASS ARTICLE USING THE SAME

摘要

Disclosed is a glass composition having a reduced sodium content and having a UV transmittance, a thermal expansion coefficient, a glass transition temperature and a softening point in levels suitable for use as an electrical glass. Specifically disclosed is a glass composition which comprises SiO<SUB>2</SUB>, Na<SUB>2</SUB>O, K<SUB>2</SUB>O, CaO, BaO and SO<SUB>3</SUB> as essential ingredients, which is characteristic in the contents of Na<SUB>2</SUB>O and K<SUB>2</SUB>O, which contains SO<SUB>3</SUB> in an amount of 0.05 to 0.5 mass% inclusive and iron oxides in the total amount of 0.05 to 0.35 mass% inclusive in terms of Fe<SUB>2</SUB>O<SUB>3</SUB>, and which contains substantially no antimony oxide or CeO<SUB>2</SUB>.