| 摘要 |
PURPOSE:To obtain the titled composition capable of controlling deterioration of the resistance value of the high-voltage electronic parts by adding Cr2O3 to PbO-B2O-SiO2-base glass free from alkali metal. CONSTITUTION:Two or more wt.% (hereinafter shown by %) Cr2O3 is added to PbO-B2O3-SiO2-base glass consisting of 48-55% PbO, 24-30% SiO2, 8-13% B2O3, 3-5% Al2O3, 2-4% Fe2O3, 0.3-1% CoO and 0.01-1% ZnO and being free from alkali metal and the mixture is heat-treated at high temp. and melted and thereafter glass obtained by quenching is crushed.
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