Grey glass composition for production of windows

Details Grey glass composition for production of windows Grey glass composition for production of windows

2007-02-20

2007-02-20

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

Reexamination Certificate

active

10481888

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:SiO264–75%Al2O3 0–5%B2O3 0–5%CaO 5–15%MgO 0–5%Na2O10–18%K2O 0–5%and the coloring agents below within the following limits by weight:Fe2O30.25–0.65% and preferably 0.5–0.65%CoOless than 20 ppm, preferably less than orequal to 15 ppmNiO40–250 ppm and preferably 70–150 ppmSe0–5 ppmwhere Fe2O3is the total iron.

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