| 摘要 |
There is provided a glass composition having a devitrification temperature of 1000 or below, a glass transformation temperature (Tg) of 535 or below and a specific gravity within a range from 3 to 4. The glass composition has a refractive index (nd) within a range from 1.60 to 1.75 and an Abbe number ( Ëd) within a range from 50 to 60. |
