Patent ID: 8319095

Claim:
A method of making a low-index silica based coating, the method comprising: forming a silica based precursor comprising a silica sol comprising a silane and/or a colloidal silica; depositing the silica precursor on a glass substrate to form a coating layer; curing and/or firing the coating layer in an oven at a temperature of from about 550 to 700° C. for a duration of from about 1 to 10 minutes; depositing a capping layer composition on the coating layer; wherein the capping layer composition comprises an antifog composition including a hydrofluoroether; curing and/or firing the surface treatment composition to form a capping layer; and wherein the method results in a coating having durability after exposure to high humidity and high temperature, and/or low humidity and low temperature, when compared to a coating not including the capping layer, and wherein said capping layer is the outermost layer of the coating.