NEUTRAL GREY GLASS COMPOSITIONS

摘要

The present invention relates to a neutral grey glass composition which has a basic composition containing the following main coloring agents: 0.40 to 0.80% of Fe2O3; 0.05 to 2.0% of TiO2; 0.2 to 2.5% of Er2O3; 20 to 200 ppm of CuO; 0.08% to 0 0.1% charcoal; and 15% to 50% of ferrous (redox), in which the glass has light transmission “A” greater than 65%, solar transmission (TS) <55%, and ultraviolet transmission <40%, having color values a*=−4 to 3 and b*=4 to −2.

主权项

1. A neutral grey glass composition, with a sodium-calcium-silicate base which contains: SiO2, from 68 to 75%; Al2O3 from 0 to 5%; CaO from 5 to 15%; MgO from 0 to 10%; Na2O from 10 to 18%; K2O from 0 to 5%; SO3 from 0.05 to 0.30%, and
the following primary colorants: Fe2O3, from 0.40 to 0.80% , TiO2 from 0.05 to 2.0% Er2O3 from 0.2 to 2.5%, CuO from 20 to 200 ppm; 0.0 to 0.1% carbon; and 15 to 50% ferrous (redox), in which the glass has an illuminant “A” light transmission of greater than 65%, solar transmission (TS)<55%, ultraviolet transmission <40%, with color values of a*=−4 to 3, and b*=4 to −2.