| 摘要 |
A glass suitable for use in ultrasonic delay lines which comprises the components by weight, SiO2 42 to 27%, PbO 71 to 52% and preferably contains K2O and/or Na2O. The glass further contains PbF2, BaF2, KHF2, K2SiF6, Na2SiF6, ZnO, CdO, BaO, SrO, ZrO2, TiO2, La2O3, Al2O3, B2O3, Sb2O3 and As2O3. |
