| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass tube for a fluorescent lamp having satisfactory UV solarization resistance and opacity to harmful UV. SOLUTION: The glass tube comprises a borosilicate glass containing, by mass, 0.001-0.05% Fe2O3, 0.05-5% WO3+Nb2O5 and 0.01-3% ZrO2 and having 36×10-7-57×10-7/ deg.C average coefficient of linear expansion and has <=1% transmittance at 253.7 nm wavelength in 1 mm thickness and <=3% deterioration degree in a prescribed ultraviolet irradiation test.
|
