Grey glass compositions of the silica-soda-lime type
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United States of America Patent
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Jul 20, 2004
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N/A
app pub date -
Aug 9, 2002
filing date -
Feb 11, 2000
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Abstract
The invention concerns a grey glass composition of the soda-lime type having a global light transmission under an illuminant A (T.sub.LA) more than 15% for a glass thickness equal to 4.85 mm, said composition comprising colouring agents as follows in the following weight percentage limits: Fe.sub.2 O.sub.3 : 0.25-0.65%, preferably 0.3-0.6% and more preferably still 0.3-0.4%; CoO: 150-250 ppm and preferably>185 ppm; NiO: 650-1000 ppm; Se<5 ppm.
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