Soda-lime-silicate glass composition
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United States of America Patent
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Apr 17, 2001
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N/A
app pub date -
Aug 12, 1999
filing date -
Oct 30, 1998
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Abstract
A neutral-colored soda-lime-silicate glass with high light transmission in the visible region. The glass has a basic composition which contains at least the following constituents: SiO.sub.2, 66-75 weight %; Na.sub.2 O, 10-20 weight %; CaO, 5-15 weight %; MgO, 0-6 weight %; Al.sub.2 O.sub.3, 0-5 weight %; and K.sub.2 O, 0-5 weight %; and incorporates a colorant portion comprising the following constituents: Co, 0.1-1 ppm; Fe.sub.2 O.sub.3, .ltoreq.0.03 weight % (total iron content); and FeO/Fe.sub.2 O.sub.3, >0.4. The glass possesses a light transmittance (illuminant D 65 according to DIN 67 507) of at least 89% at a reference thickness of 4 mm.
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