| 摘要 |
The instant invention is directed to optical glass compositions capable of being shaped under the combined action of temperature and pressure in a mold so as to obtain articles having surfaces exhibiting highly precise reproduction of the mold walls. The inventive glasses demonstrate softening points not exceeding 500 DEG C., refractive indices between about 1.65-1.82, Abbe number between about 27-39, and consist essentially, in weight percent, of -SiO2 8-20 -B2O3 5-20 -PbO 50-70 -Al2O3 1-11 -F 2-7 -
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