Aqueous metal coordination compounds as protective coatings for glass

摘要

Coordination compounds having good stability in aqueous systems are used to treat glass surfaces at elevated temperatures, the coordination compounds being represented by the general formula Y.sub.2 MX.sub.6 wherein Y is an alkali metal, hydrogen or ammonium, M is tin, titanium or zirconium and X is a halogen, generally fluorine or chlorine. The glass surfaces so treated are rendered chemical resistant and when treated by conventional cold-end coatings exhibit excellent strength, scratch resistance and chemical durability.