Glass with low solar transmittance
AssigneeCentral Glass Company, Limited
InventorsTatsuya Tsuzuki, Katsushi Yoshimura, Takahiro Mori
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Abstract
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.
Claims7
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, and
- 3-150 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.
Dependencies are inferred from the claim text.