| 摘要 |
<p>This invention relates to glass compositions especially suitable for projection cathode ray tube faceplates which are essentially free from PbO and other readily reducible metal oxides, fluorine, ZnO, TiO2, and MgO, and which consist essentially, in weight percent, of Li2O 0.75-3 Na2O 5-7 K2O 5-7 SrO 7.5-10 BaO 14-16 CaO 0-3 Li2O+Na2O+K2O 11-16 CaO+SrO+BaO 21.5-26 Al2O3 1-2 ZrO2 2-7 CeO2 0.4-0.8 SiO2 55-60.e</p> |
