Abstract: This specification is directed to a method for improving emmissivity value of a pyrolytically applied doped tin oxide film on a surface of a glass substrate, such as a sheet of glass. The method includes the steps of heating the surface of the glass substrate to an initial temperature in a range from 560.degree.-650.degree. C. and thereafter applying to the surface of the glass substrate a doped tin oxide film by a pyrolytic decomposition process. The pyrolytic decomposition process is one which cools the surface of the glass substrate. The surface of the glass substrate is reheated to a temperature equal to or greater than the initial temperature but not in excess of 675.degree. C. Thereafter, a doped tin oxide film is applied to the previously coated surface of the glass substrate. The reheating and application steps may be repeated as many times as desired to produce a coated glass substrate having the desired coating thickness and emmissivity characteristics.

Abstract: This disclosure is directed to a method of obtaining coated glass articles having a desired shading coefficient with the most economical thickness of coating composition applied thereto. The method taught is characterized by the following steps. A plurality of glass samples are coated with a selected coating composition. This coating operation is carried on the various glass samples in a manner such that the glass samples have different coating thicknesses of the selected coating composition. The thickness of the coating composition on each glass sample, along with the resulting shading coefficient, is measured. The correlation is made between the thickness of coating and the resulting shading coefficient. The correlation is one which will define two separate functions interconnected by a transition point. A first function (1) is one in which the shading coefficient decreases with increasing coating thickness.

Abstract: This specification discloses a method of forming a high performance reflective film on a glass sheet. The glass sheet is one which is at a temperature sufficiently high to pyrolyze an organic based, metal containing glass coating composition coming into contact therewith. An organic based, heated pyrolyzable, dual metal containing glass coating composition is directed against a surface of the heated glass sheet. The dual metals in this coating composition are cobalt and iron. The dual metals are present in the coating composition by weight percentage of dual metals in a range from 97% cobalt/3% iron to 90% cobalt/10% iron, preferably 96% cobalt/4% iron to 92% cobalt/8% iron, and most preferably 95% cobalt/5% iron to 93% cobalt/7% iron.