Method for producing chemically tempered glass, method for extending the life of molten salt composition and molten salt composition

摘要

PROBLEM TO BE SOLVED: To provide a method for producing chemically strengthened glass, which comprises a step of chemically strengthening lithium-containing glass by using a molten salt composition containing at least one of potassium nitrate and sodium nitrate, a heterogeneous anion compound and boron as an impurity. It is an object of the present invention to provide a production method capable of suppressing deterioration of appearance due to contamination with boron and extending the life of the molten salt composition. The present invention comprises the step of chemically strengthening a lithium-containing glass by using a molten salt composition containing at least one of potassium nitrate and sodium nitrate, a heterogeneous anion compound, and boron as an impurity. The method relates to a method for producing chemically strengthened glass, wherein the molten salt composition contains a divalent metal nitrate. [Selection diagram] None