| 摘要 |
PROBLEM TO BE SOLVED: To provide low thermal expansive glass exhibiting a superior clarifying effect without containing an As ingredient and an Sb ingredient and being excellent in chemical durability. SOLUTION: The glass is characterized by including an SiO<SB>2</SB>ingredient, an Al<SB>2</SB>O<SB>3</SB>ingredient, a CeO<SB>2</SB>ingredient and/or an SnO<SB>2</SB>ingredient and <0.1% B<SB>2</SB>O<SB>3</SB>ingredient in terms of oxides and by that the total amount γ of the CeO<SB>2</SB>ingredient and/or the SnO<SB>2</SB>ingredient is satisfied with an equation of γ≥0.005α-5.25 (wherein, α is liquid phase temperature). It is more favorable that the content of the SiO<SB>2</SB>ingredient is 45-68% and the content of the Al<SB>2</SB>O<SB>3</SB>ingredient is 16-35% in terms of oxides in mass%. COPYRIGHT: (C)2010,JPO&INPIT
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