COMPOSITION FOR GREY SILICA-SODIUM CALCIC GLASS FOR PRODUCING GLAZING

摘要

The invention relates to a composition for silica-sodium-calcic glass containing the following colouring agents whose content varies within the following bound weights: 0.01-0.14 Fe2O3 (total iron), 40-150 ppm CoO and 200-700 ppm NiO. A weight ratio NiO/CoO ranges from 3.5 to 6. The inventive glass has a total light transmission at a light source D65 (TLD65) ranging from 20 to 60 % when measured for the thickness thereof equal to 6 mm. A glass sheet possibly heat treated and made of the inventive composition and a glazing comprising at least one of said sheets, in particular for building are also disclosed.