Abstract: The glass composition of the present invention contains, in mol %: 58% or more and less than 70% SiO2; 0 to 14% B2O3; 10 to 16% Al2O3; 0 to 12.5% MgO; 0 to 11% CaO; 0 to 3% SrO; 0 to 3% ZnO; 4.5 to 11% Li2O; 0 to 2% Na2O; 2 to 7% K2O; 0 to 0.8% TiO2; 0 to 0.5% ZrO2; and 0 to 0.2% SnO2. In this glass composition, the total content of Li2O, Na2O, and K2O is in a range of 6.5 to 13%. The glass composition of the present invention is suitable for production by a float process and is suitable for chemical strengthening. The glass composition of the present invention has a low thermal expansion coefficient. The glass composition of the present invention has properties suitable for use in glass substrates for displays.

Abstract: The glass substrate of the present invention includes, in terms of mass %: 58.5-69.5% SiO2, 2.5-9.9% Al2O3, 0-2.5% Li2O, 0%?Na2O<6%, 0%?K2O<6%, 0% <MgO?5.2%, 3%<CaO?13%, 10-27% SrO, 0%?BaO<5%, 0-3% TiO2, and 0-9.8% ZrO2. SiO2+Al2O3?73%, Li2O+Na2O+K2O<6%, 3%<MgO+CaO?16%, SrO+BaO 10-27%, MgO+CaO+SrO+BaO 21-33%, and MgO/CaO 0.2-1.0 in molar fraction. The glass substrate is substantially free from B2O3. Glass transition point >555° C., liquidus temperature ?1200° C., and average thermal expansion coefficient ?75×10?7/° C. The present invention can provide a glass substrate having a thermal expansion coefficient close to those of a semi conductor film, etc. and a high strain point, and suitable for continuous production by a float process.

Abstract: The glass substrate of the present invention includes, in terms of mass %: 58.5-69.5% SiO2, 2.5-9.9% Al2O3, 0-2.5% Li2O, 0%?Na2O<6%, 0%?K2O<6%, 0%<MgO?5.2%, 3%<CaO?13%, 10-27% SrO, 0%?BaO<5%, 0-3% TiO2, and 0-9.8% ZrO2. SiO2+Al2O3?73%, Li2O+Na2O+K2O<6%, 3%<MgO+CaO?16%, SrO+BaO 10-27%, MgO+CaO+SrO+BaO 21-33%, and MgO/CaO 0.2-1.0 in molar fraction. The glass substrate is substantially free from B2O3. Glass transition point >555° C., liquidus temperature ?1200° C., and average thermal expansion coefficient ?75×10?7/° C. The present invention can provide a glass substrate having a thermal expansion coefficient close to those of a semi conductor film, etc. and a high strain point, and suitable for continuous production by a float process.

Abstract: The present invention provides a glass composition in which a smaller amount of arsenic oxide or antimony oxide that has a heavy burden on the environment is used and fewer bubbles remain. This glass composition includes, in terms of mass %: 40 to 70% of SiO2, 5 to 20% of B2O3, 10 to 25% of Al2O3, 0 to 5% of MgO (up to and not including 5%), 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 0 to 1.5% of Li2O, 0 to 1.5% of Na2O, 0 to 1.5% of K2O, and 0 to 1.5% of Cl. The sum of the contents of Li2O, Na2O, and K2O is 0.05 to 1.5 mass %, and the content of K2O is equal to or larger than that of Na2O.