ALKALI-FREE GLASS AND ALKALI-FREE GLASS PLATE USING SAME

摘要

The present invention has a strain point of 680 to 735 ° C, an average coefficient of thermal expansion at 50 to 350 ° C of 30 × 10 ^-7 to 43 × 10 ^-7 / ° C, a specific gravity of 2.60 or less, in terms of mole percentage on an oxide basis, 65 to 69% SiO ₂ , 11.5 to 14% Al ₂ O ₃ , 3 to 6.5% B ₂ O ₃ , 1 to 5% MgO, 7.5 to 12% CaO, 0 to 1% SrO, BaO To an alkali free glass containing 0.5 to 6% of ZrO ₂ and 0 to 2% of ZrO ₂ .