| 摘要 |
Disclosed is a glass composition for lamps which contains Mo ions as a component, substantially comprising the following that are expressed in terms of oxides: SiO 2 : 55 to 75 wt%, B 2 O 3 : 11 to 25 wt%, MoO 3 : 0.3 to 1.4 wt%, Al 2 O 3 : 1 to 10 wt%, Li 2 O : 0 to 10 wt%, Na 2 O : 0 to 10 wt%, K 2 O : 0 to 10 wt%, Li 2 O + Na 2 O + K 2 O: 1 to 10 wt%, MgO : 0 to 5 wt%, CaO : 0 to 10 wt%, SrO : 0 to 10 wt%, BaO : 0 to 10 wt%, MgO + CaO + SrO + BaO: 1 to 10 wt%. By having such a constitution, the glass composition has a high ultraviolet shielding effect and hardly suffers from coloring.
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