Ultraviolet absorbing green tinted glass

Details Ultraviolet absorbing green tinted glass Ultraviolet absorbing green tinted glass

C - Chemistry, Metallurgy

03

C

C03C 4/08 (2006.01) C03C 3/087 (2006.01) C03C 3/095 (2006.01) C03C 4/02 (2006.01)

Patent

CA 2048061

A green tinted, ultraviolet absorbing glass is obtained by the addition of colorant to a standard soda-lime-silica base glass composition and a colorant includes less than 0.5 weight percent of cerium oxide (CeO2), greater than 0.85 weight percent of total iron expressed as Fe2O3 and a ratio of ferric iron expressed as FeO to total iron of less than 0.275. The glass has a low ultraviolet transmittance, viz., no greater than 31 percent over the wavelength range of 300 to 390 nanometers at a reference glass thickness of 3.9 millimeters. An advantage of the glass of this invention over competing ultraviolet absorbing glass is the use of larger amounts of total iron and smaller proportions of iron in the ferrous state to obtain the low ultraviolet transmittance. In this manner, the amounts of cerium oxide which is expensive is reduced.

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