UV-radiation absorbing glass with high chemical resistance, especially for a fluorescent lamp, and methods of making and using same

摘要

The chemically resistant borosilicate glass has the following composition (in % by weight): SiO₂, 67-74; B₂O₃, 5-10; Al₂O₃, 3-10; Li₂O, 0-4; Na₂O, 0-10; K₂O, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO₂, 0-3; CeO₂, 0-1; with ΣLi₂O+Na₂O+K₂O=0.5 to 10.5 and ΣMgO+CaO+SrO+BaO+ZnO=0-6. The borosilicate glass is characterized by a composition including 0 to 10% of at least one of TiO₂, Bi₂O₃ and MoO₃ and a sum total of TiO₂+Bi₂O₃+MoO₃ of 0.1 to 10%. This glass is obtained from the melt under oxidative conditions. The glass is useful in gas discharge lamps, such as Xenon lamps and fluorescent lamps, and display devices, flat structured backlighting devices, and glass-to-metal seals with Mo, Wo and Ni—Fe—Co alloys.