Tinted float glass

Abstract

A tinted float glass includes a base glass portion comprising: SiO2 68-75 wt % Al2O3 0-3 wt % Na2O 11-15 wt % K2O 0-3 wt % CaO 6-11 wt % MgO 2-6 wt % and a colorant portion comprising iron, cobalt and selenium in the following ranges: Fe2O3 0.30-0.40 wt % Co3O4 46-60 ppm Se 1-5 ppm The tinted float glass is blue-grey in transmitted color, and is suitable for architectural, automotive, and other applications. A particularly preferred embodiment of the glass has a colorant portion comprising 0.31-0.33% Fe2O3, 51-55 ppm Co3O4 and 2-4 ppm selenium, together with a light transmission (Ill D65) of 59 to 62%, a dominant wavelength of 482 nm, a color purity of 7 to 8%, and a performance of 3 to 7%; all in a sample 6.0 mm thick. The glass may be coated with a low emissivity coating.

Dependencies are inferred from the claim text.