| 摘要 |
<p>Disclosed is a glass composition including 60 to 70 % by mass of SiO 2 , 0.5 to 3.0 % by mass of Al 2 O 3 , 2 to 8 % by mass of Na 2 O, 5 to 15 % by mass of K 2 O, 8 to 13 % by mass of MgO, 0 to 5 % by mass of CaO, 0 to 8 % by mass of SrO and 0.5 to 5 % by mass of ZrO 2, and substantially excluding BaO and B 2 O 3 , wherein a total amount of Na 2 O and K 2 O is 8 to 18 % by mass, and a total amount of MgO, CaO and SrO is 10 to 22 % by mass.</p> |
