Grey glass composition for production of windows
AssigneeSaint-Gobain Glass France
InventorsLaurent Teyssedre, Pierre Jeanvoine
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Abstract
The subject of the invention is a gray glass composition of the soda-lime-silicate type having an overall light transmission under illuminant A (TLA) greater than 67% for a glass thickness equal to 3.85 mm, which comprises the constituents below within the following limits by weight: 1 SiO2 64-75% Al2O3 0-5% B2O3 0-5% CaO 5-15% MgO 0-5% Na2O 10-18% K2O 0-5% and the coloring agents below within the following limits by weight: 2 Fe2O3 0.25-0.65% and preferably 0.5-0.65% CoO less than 20 ppm, preferably less than or equal to 15 ppm NiO 40-250 ppm and preferably 70-150 ppm Se 0-5 ppm where Fe2O3 is the total iron.
Claims18
A gray glass composition of the soda-lime-silicate type having an overall light transmission under illuminant A (TLA) greater than 67% for a glass thickness equal to 3.85 mm, characterized in that it comprises the constituents below within the following limits by weight:
- 8 SiO2 64-75% Al2O3 0-5% B2O3 0-5% CaO 5-15% MgO 0-5% Na2O 10-18% K2O 0-5%
- and the coloring agents below within the following limits by weight:
- 9 Fe2O3 0.25-0.65% and preferably 0.5-0.65% CoO less than 20 ppm, preferably less than or equal to 15 ppm NiO 40-250 ppm and preferably 70-150 ppm Se 0-5 ppm where Fe2O3 is the total iron.
Dependencies are inferred from the claim text.