| 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 SiO 2 , 1 to 7% of Al 2 O 3 , 10 to 25% of B 2 O 3 , 3 to 15% of Li 2 O+Na 2 O+K 2 O, 0 to 5% of CaO+MgO+BaO+SrO+ZnO, 0.001 to 0.05% of Fe 2 O 3 , 0.1 to 5% of CeO 2 , 0.01 to 5% of SnO+SnO 2 and 0.01 to 5% of ZrO 2 +ZnO+Nb 2 O 5 , and having an average linear expansion coefficient in a range of 36 to 57×10 -7 /°C at 0 to 300°C defined in JIS R 3102.</p> |
