| 摘要 |
<p>The glass has a chemical composition as a percentage by weight within the following range: silica 50-58, potash 0-13, soda 0-9, lithium oxide 0-4, calcium oxide 0-3, magnesium oxide 0-4, boric anhydride 0-2, zinc oxide 16-30, barium oxide 0-12, titanium oxide 0-6, zirconium oxide 0-5, yttrium oxide 0-5, alumina 0-3, tin oxide 0-5, lanthanum oxide 0-9, niobium oxide 0-9, bismuth oxide 0-12, germanium oxide 0-5.</p> |
