| 摘要 |
<p>A scratch-resistant glass essentially comprising the following components and having a density of 2.41 g/cc or less as determined at room temperature: SiO2 75.5 - 85.5 (wt.%), RO 1 - 8 (wt.%), R'2O 10 - 23.5 (wt.%), RO+R'2O 11 - 24.5 (wt.%), A12O3 0 - 5 (wt.%), RO/R'2O (by wt.) 0.5 or less, wherein R represents at least one of Mg and Ca; R' represents at least one of Li, Na and K.</p> |
