Colored glass plate and method for its production

摘要

To provide a colored glass plate which, despite containing substantially no expensive cerium, simultaneously satisfies low solar transmittance, high visible light transmittance and low UV transmittance, while transmitted light has a green color tone. The colored glass plate comprises, as represented by mass percentage based on oxides, SiO2: from 65 to 75%, Al2O3: from 0 to 6%, MgO: from 2 to 6%, CaO: from 5 to 15%, total iron calculated as Fe2O3: from 0.3 to 1.2%, total titanium calculated as TiO2: from 0.2 to 1.1%, and total vanadium calculated as V2O5: from 0.02 to 0.3%, and contains substantially no cerium, cobalt, chromium or manganese.

主权项

1. A colored glass plate comprising, as represented by mass percentage based on oxides:
SiO2: from 65 to 75%, Al2O3: from 0 to 6%, MgO: from 2 to 6%, CaO: from 5 to 15%, total iron calculated as Fe2O3: from 0.5 to 1.2%, total titanium calculated as TiO2: from 0.2 to 1.1%, and total vanadium calculated as V2O5: from 0.02 to 0.3%, wherein said colored glass plate comprises substantially no cerium, cobalt, chromium or manganese and has: a solar transmittance as stipulated in JIS R3106 (1998) of at most 55% as a value calculated in a thickness of 4 mm, a visible light transmittance (illuminant A, 2 degrees field of vision) as stipulated in JIS R3106 (1998) of at least 70% as a value calculated in a thickness of 4 mm, an UV transmittance as stipulated in ISO-9050 of at most 12% as a value calculated in a thickness of 4 mm, and a dominant wavelength of transmitted light as stipulated in JIS Z8701 (1982) of from 540 to 570 nm.