| 摘要 |
<p>Disclosed is an ultraviolet absorbing glass for fluorescent lamps, which is composed of a borosilicate glass containing, in mass %, 60 to 80% of SiO2, 1 to 7% of Al2O3, 10 to 25% of B2O3, 3 to 15% of Li2O+Na2O+K2O, 0 to 5% of CaO+MgO+BaO+SrO+ZnO, 0.1 to 5% of CeO2, 0.005 to 0.1% of Fe2O3, 0.01 to 5% of SnO+SnO2 and 0.1 to 10% of ZrO2+ZnO, and having 10% or less of an abundance ratio of Ce4+ ions to the total Ce ions in the glass and an average linear expansion coefficient in a range of 36 to 57x10-7/° C. at 0 to 300° C. defined in JIS R 3102.</p> |
