| 摘要 |
<p>A lead-free glass composition comprising: from about 30 % to about 51 % by weight silicon dioxide, from about 19 % to about 50 % by weight boron oxide, from about 2 % to about 20 % by weight zirconium oxide, up to 14 % by weight sodium oxide, up to about 6 % by weight potassium oxide, up to about 19 % by weight zinc oxide, and up to about 5 % by weight lithium oxide; and from about 2 to about 8 parts by weight fluorine per 100 parts of the other components in said composition. Additionally, up to about 8 % by weight barium oxide and up to about 4 % by weight titanium dioxide can be added to the foregoing glass composition.</p> |
