| 摘要 |
A lead and arsenic free borosilicate glass is provided which is suitable for use in electric arc discharge lamps (10). The outer envelope (14) and the stem (16) are made of tungsten-sealing borosilicate glass which provides desirable protection from ultraviolet radiation. In addition, the glass is resistant to surface scum formation during melting and reduces the amount of batched iron which must be added for UVB protection.
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