A process for preventing the weathering (especially clouding, tarnishing and lustering) of the surface of glass

摘要

294,391. Kamita. K., and Asahi Garasu Kabushiki Kaisha,. Aug. 25, 1927. Weathering, preventing. - A process for preventing the clouding of glass by atmospheric influences consists in allowing a gas consisting of, or containing, an acid gas to act on the surface of the glass at an elevated temperature. Air or furnace gases containing sulphur dioxide, sulphur trioxide, hydrogen chloride, or other acid gas or vapour, is allowed to act on the surface of the glass while it is maintained at about the annealing temperature. The surface becomes covered' with a white powder which is wiped off when the glass is cool.