Abstract: The low-sodium-oxide glass and glass tube, which have the following chemical components 55.0-70.0% SiO2, 2.0-4.0% Al2O3, 3.0-7.0% MgO, and CaO, 0-3.5% SrO, 10.5-13.0% BaO, 2.0-4.0% Li2O, <1.0% Na2O, 11.0-14.0% K2O, 0.1-0.6% CeO2, (0.02%) TiO2, and (0.03%) Fe2O3, has been disclosed to replace the borosilicate glass, with improvements to the physical properties and chemical durability, transmittance percentage controlled in the wave length interval at 313 nanometers (nm.), including the dielectric constant at the temperature of 25° C., 1 MHz and the dielectric loss, tan ?, or the dissipation factor at the temperature of 25° C., 1 MHz, for maximum effectiveness for the light bulb manufacturing industry and also for other industries, for instance, backlights tubes, fluorescent lamps, circular fluorescent lamps, compact fluorescent lamps, stems (flare tubes), and exhaust tubes.

Abstract: The low-sodium-oxide glass and glass tube, which have the following chemical components 55.0-70.0% SiO2, 2.0-4.0% Al2O3, 3.0-7.0% MgO, and CaO, 2.0-5.0% SrO, 9.0-12.0% BaO, 2.0-4.0% Li2O, 0-0.15% Na2O, 12.0-14.0% K2O, 0.1-0.6% CeO2, (0.03%) Fe2O3, and (0.15%) SO3, replace the borosilicate glass, with improvements to the physical properties and chemical durability, transmittance percentage controlled in the wave length interval at 313 nanometers (nm.), for maximum effectiveness for the light bulb manufacturing industry and also for other industries.