| 摘要 |
PROBLEM TO BE SOLVED: To provide alkaline-free glass having low density, high Young's modulus and low coefficient of expansion. SOLUTION: The alkaline-free glass consists of, by mol%, 60 to 75 SiO2, 1 to 16 Al2O3, 1 to 20 B2O3, 0 to 10 MgO, 0 to 12 CaO, 0 to 10 SrO, 0 to 1.5 BaO and 0.05 to 5 Y2O3 and does not substantially contain alkali metal oxides. |
