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, expressed in mole percentage on an oxide basis, SiO ₂ 65 to 69%, Al ₂ O ₃ 11.5 to 14%, B ₂ O ₃ 3 to 6.5%, MgO 1 to 5%, CaO 7.5 to 12%, SrO 0 to 1%, BaO the present invention relates to an alkali-free glass containing 0 to 2% 0.5 to 6%, ZrO _2.