| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass substrate for a flat panel display unit which has excellent thermal impact resistance, and has no problem with thermal deformation and thermal shrinkage even when heat-treated at 570 to 600 deg.C. SOLUTION: The glass substrate for a flat panel display unit has a composition containing, by mass, 50 to 65% SiO2 , 5 to 15% Al2 O3 , 4.5 to 9% MgO, 0 to 5% CaO, 6.5 to 15% SrO, 0 to 5% BaO, 15 to 20% MgO+CaO+SrO+BaO, 0 to 5% Na2 O, 4 to 11% K2 O, 8 to 12% Na2 +K2 O and 0.3 to 2% ZrO2 .
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