| 摘要 |
An alkali-free glass substrate containing, by mass percent, 50-70% of SiO<SUB>2</SUB>, 10-25% of Al<SUB>2</SUB>O<SUB>3</SUB>, 5-20% of B<SUB>2</SUB>O<SUB>3</SUB>, 0-10% of MgO, 0-15% of CaO, 0-10% of BaO, 0-10% of SrO and 0-5% of ZnO, also containing SnO<SUB>2 </SUB>and/or Sb<SUB>2</SUB>O<SUB>3 </SUB>and having a beta-OH value of at least 0.485/mm.
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