LOW LIGHT TRANSMISSION NEUTRAL GRAY GLASS

摘要

The invention relates to a glass comprised of silicon, sodium and calcium of neutral grey colour with low light transmission (less than 20 %). The glass reduces the solar energy transmission such as for example t he transmission of neat infrared radiation (less than 14 %) and to a large extent the transmission of ultraviolet radiation transmission (less than 12 %). This glass comprises the following components expressed in percentages by weight Fe2O3 between 1.20 and 2.0 %; FeO between 18 and 28 % (reduction percentage); Co3O4 between 0.020 and 0.030 %; selenium between 0.0025 and 0.010 %; CuO between 0.0050 a nd 0.050 %. The glass of the invention avoids using colorant compounds such as nickel, chromium and manganese.