| 摘要 |
PROBLEM TO BE SOLVED: To attain enhanced work efficiency, a reduced cost and high productivity in the production of a glass substrate for an information recording medium by simultaneously carrying out chemical tempering and alkali removal treatment. SOLUTION: When a glass substrate is chemically tempered with a tempering salt bath, the nitrate of a metal having a smaller ionic radius than ions in the tempering salt bath, e.g. silver nitrate is added to the tempering salt bath by 0.1-10 wt.% and the chemical tempering and alkali removal treatment of the glass substrate are carried out by one-step treatment using the resulting salt bath. The chemical tempering and alkali removal treatment can be continuously and simultaneously carried out.
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