酸化物組成より見た硼珪酸硝子の實用を目的とした研究 (第3報)

概要

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Characteristics in oxide composition of commercial borosilicate glasses for electronic tubes and lamps are explained. In the oxide composition region for these glasses, the lines of constant thermal expansion coefficient, the isothermal lines of softening point and transformation point and the lines of constant chemical durability are shown which are more accurate and detailed than the authors previous data.The contradiction which is often encountered between high chemical durability and low transformation temperature, may be solved for some cases by introducing Al2O3 and PbO in these glasses.
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