| 摘要 |
PURPOSE:The titled inexpensive glass useful as Braun tube of color television, etc., having improved absorption ability of X-ray with short wave length, constituting basic components consisting of SiO2, Na2O, K2O, ZrO2, tin oxide, and GeO2 in a specific weight ratio. CONSTITUTION:Glass raw materials consisting of 45-65wt% SiO2, 4-10wt% Na2O, 4-10wt% K2O, 3-10wt% ZrO2, 1-15wt% (calculated as SnO2) tin oxide, and 0.1-1wt% CeO2 are blended, melted under heating, cast into a mold, and annealed, to give the desired X-ray absorption glass. Since the prepared glass contains tin oxide, it has absorption ability to X-ray with <=0.4Angstrom wave length which is generated when electric voltage exceeding >30kV is applied to Braun tube of color television, it is not colored by irradiation of electron beam or X- ray, and suitably used as a face plate for Braun tube, etc.
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