Glass for display substrate

A glass having a SiO2-Al2O3-B2O3-RO (RO is at least one of MgO, CaO, BaO, SrO and ZnO) based composition, a temperature corresponding to 10 poise being 1570 DEG C or higher and an alkali content of 0.01 to 0.2% and a ZrO2 content of 0.01 to 0.3%, as expressed in % by mass. And, a glass having a SiO2-Al2O3-B2O3-RO (RO is at least one of MgO, CaO, BaO, SrO and ZnO) based composition, a density of 2.5 g/cm or less, an average thermal expansion coefficient of 25 to 36x10/ DEG C in a temperature range of 30 to 380 DEG C, a strain point of 640 DEG C or higher and an alkali content of 0.01 to 0.2% and a ZrO2 content of not less than 0.01% and less than 0.4%, as expressed in % by mass.