MOLTEN SALT FOR USE IN TOUGHENING GLASS, PRODUCTION METHOD OF TOUGHENED GLASS, AND LIFE EXTENSION METHOD OF MOLTEN SALT FOR USE IN TOUGHENING GLASS

摘要

In the present invention, a melt containing potassium nitrate to be used for the chemical strengthening of the glass for the salt, and the service life is extended sufficiently to provide a molten salt for the purpose. The present invention provides a molten salt for glass-used to form a compression stress layer on the glass surface by ion exchange, containing potassium nitrate and carbonate anions and phosphate anions of at least one of the molten salt for glass-reinforced further contains It relates.