| 摘要 |
An alkali free glass consisting essentially of from 50 to 60 wt % of SiO2, from 8 to 16 wt % of Al2O3, from 4 to 10 wt % of B2O3, from 1.5 to 5 wt % of MgO, from 0 to 7 wt % of CaO, from 0 to 10 wt % of SrO, from 10 to 20 wt % of BaO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides.
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