Alkali-free glass substrate
An alkali-free glass substrate containing, by mass percent, 50-70% of SiO 2 , 10-25% of Al 2 O 3 , 5-20% of B 2 O 3 , 0-10% of MgO, 0-15% of CaO, 0-10% of BaO, 0-10% of SrO and 0-5% of ZnO, also containing SnO 2 and/or Sb 2 O 3 and having a β-OH value of at least 0.485/mm.
1. An alkali-free glass substrate comprising a glass having a β-OH value of at least 0.485/mm and containing SnO 2 and/or Sb 2 O 3 .
2. The alkali-free glass substrate as recited in claim 1 , wherein said β-OH value is at least 0.5/mm.
3. The alkali-free glass substrate as recited in claim 1 , wherein said glass contains, by mass percent, 50-70% of SiO 2 , 10-25% of Al 2 O 3 , 5-20% of B 2 O 3 , 0-10% of MgO, 0-15% of CaO, 0-10% of BaO, 0-10% of SrO and 0-5% of ZnO.
4. The alkali-free glass substrate as recited in claim 1 , wherein the glass has an As 2 O 3 content of 0.4% or less by mass.
5. The alkali-free glass substrate as recited in claim 1 , wherein the SnO 2 content is 0.05-1% by mass.
6. The alkali-free glass substrate as recited in claim 1 , wherein the Sb 2 O 3 content is 0.05-3% by mass.
7. The alkali-free glass substrate as recited in claim 1 , wherein the glass has a Cl 2 content of 0.1% or less by mass.
8. The alkali-free glass substrate as recited in claim 1 , wherein said substrate has an area of at least 0.5 m 2 .
9. The alkali-free glass substrate as recited in claim 1 , wherein said glass substrate is used as a transparent glass substrate for a liquid crystal display.