Alkali-free glass and method for producing alkali-free glass plate using the same

摘要

The present invention relates to an alkali-free glass having a strain point of from 680 to 735°C, an average thermal expansion coefficient at from 50 to 350°C of from 30×10 -7 to 43×10 -7 /°C, and a specific gravity of 2.60 or less, and containing, indicated by mol% on the basis of oxides, 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 0.5 to 6%, and ZrO 2 0 to 2%.