METHOD FOR ADJUSTING Na ION CONCENTRATION IN MOLTEN SALT AND METHOD FOR MANUFACTURING TEMPERED GLASS

摘要

PROBLEM TO BE SOLVED: To provide a method for adjusting a Na ion concentration in a molten salt capable of restoring a state in which a high CS value can be imparted when a CS value imparted to glass by a continuous use is reduced.SOLUTION: A method for adjusting a Na ion concentration in a molten salt subjected to an ion exchange treatment includes contacting an inorganic ion exchange material containing K with the molten salt in a glass chemical strengthening step.