Hardening lead and barium free crystal glass, comprises e.g. adjusting the temperature of the crystal glass, and applying a mixture comprising aluminum and a solution of potassium phosphate and sodium phosphate in water to the glass surface

摘要

Hardening lead and barium free crystal glass, comprises (a) adjusting the temperature of the crystal glass to 300[deg] C to below the glass transition temperature of the crystal glass, (b) applying a mixture comprising aluminum and a solution of potassium phosphate and sodium phosphate in water to the glass surface, and forming a solid layer on the glass surface, (c) adjusting the temperature of the crystal glass to at least 300[deg] C to below the glass transition temperature of the crystal glass, (d) cooling the crystal glass at a temperature of = 30[deg] C and (e) removing the solid layer. An independent claim is also included for the lead and barium free crystal glass, which is obtained by the above mentioned method.