NEUTRAL GREY GLASS COMPOSITION

摘要

The invention relates to a neutral grey glass composition having a base composition comprising a silicon-sodium-calcium glass containing the following main colouring agents: 0.3 - 0.7 wt.-% Fe2O3; 0 - 30 ppm CO3O4; 1 - 20 ppm Se; and 20 - 200 ppm CuO. The glass has a transmission value in relation to illuminating light "A" greater than 65%, solar energy transmission of less than or equal to 60%, ultraviolet solar transmission of less than 46%, a dominant wavelength of between 490 nm and 600 and an excitation purity of at least 6.