Alkali-free glass plate

Abstract

This invention provides an alkali-free glass plate with excellent manufacturability and sufficiently high strain point and Young's modulus at a low cost. The alkali-free glass plate of the present invention is characterized in that, as a glass composition, it contains, in mol%, 65-73% SiO2, 10-15% Al2O3, 0-5% B2O3, 0-0.5% Li2O + Na2O + K2O, 0.1-8% MgO, 0-10% CaO, 0-6% SrO, 0-5% BaO, 8-25% MgO + CaO + SrO + BaO, and 0.0001-10% Y2O3, and the mol% ratio of (MgO + CaO + SrO + BaO) / Al2O3 is 0.5-2, the mol% ratio of (CaO + SrO) / Y2O3 is 0.1-12, the mol% ratio of SiO2 / (MgO + CaO + SrO + BaO) is 2.8-9, and the mol% ratio of (B2O3 + BaO) / MgO is 0-2.