Glass with low solar transmittance

摘要

Disclosed is a glass with low solar transmittance, which is characterized by that it has a basic composition of soda-lime-silica glass, that it contains as coloring components 0.70-1.70 mass % of Fe2O3 (total iron in terms of ferric iron), 0.15-0.45 mass % of FeO (ferrous iron), 0-0.8 mass % of TiO2, 100-350 ppm of CoO, 0-60 ppm of Se, 100-700 ppm of Cr2O3, and 3-150 ppm of MnO, that it has a ratio (Fe2+/Fe3+) of ferrous iron to ferric iron of 0.20-0.80. This glass has superior ultraviolet absorbing performance and infrared absorbing performance (heat insulation performance) and an appropriate transparency.

主权项

1. A glass with low solar transmittance, comprising:
a basic composition of soda-lime-silica glass, and as coloring components
0.70-1.70 mass % of Fe2O3 (total iron in terms of ferric iron),0.15-0.45 mass % of FeO (ferrous iron),0-0.8 mass % of TiO2,100-350 ppm by mass of CoO,1-50 ppm by mass of Se,100-700 ppm by mass of Cr2O3, and3-150 ppm by mass of MnO, and having a ratio (Fe2+/Fe3+) of ferrous iron to ferric iron of 0.20-0.80, a solar transmittance of 30% or less, a visible light transmittance of 5-30% and an ultraviolet transmittance of 30% or less in terms of 4 mm thickness by a measurement using an illuminant A, a ratio of a visible light transmittance to a solar transmittance of 0.50 or greater and a ratio of a ultraviolet transmittance to the solar transmittance of 1.25 or less.