GLASS AND METHOD FOR MANUFACTURING GLASS

The present invention addresses the problem of suppressing deflection. The glass 10 contains, in mol% on the basis of oxides, 35%-60% of SiO2, 0.8%-8% of B2O3, 6%-21% of Al2O3, and 17%-44% of MgO, with (MgO/Al2O3) > = 1, the measured Magdrone constant m calculated by formula (1A) is 1.05 or more, and the thermal expansion factor, which is the ratio of the measured value alpha of the coefficient of linear thermal expansion to the calculated value alpha cal of the coefficient of linear thermal expansion calculated from the composition, is 0.7 or less. Here, E is the measured value of the Young's modulus of the glass 10, Vp is the average atomic filling rate of the glass 10, and Gt is the average bond dissociation energy of the glass 10. 本发明的课题是抑制挠曲。玻璃10以氧化物基准的摩尔％表示含有SiO2：35％～60％、B2O3：0.8％～8％、Al2O3：6％～21％、MgO：17％～44％，并且(MgO/Al2O3)≥1，由式(1A)算出的测定马德隆常数m为1.05以上，线性热膨胀系数的测定值α与由组成算出的线性热膨胀系数的计算值αcal的比率即热膨胀因子为0.7以下。这里，E是玻璃10的杨氏模量的测定值，Vp是玻璃10的平均原子填充率，Gt是玻璃10的平均键离解能。