ULTRAVIOLET LIGHT ABSORBING GREY GLASS COMPOSITION Russian patent published in 2010 - IPC C03C3/87 C03C4/08 

FIELD: chemistry.

SUBSTANCE: novel grey glass composition which absorbs ultraviolet light is disclosed, where the grey glass contains a main glass composition containing SiO₂ 65-75 wt %, Na₂O 10-20 wt %, CaO 5-15 wt %, MgO 0-5 wt %, Al₂O₃ 0-5 wt %, K₂O 0-5 wt %, B₂O₃ 0-5% and MnO₂ 0-0.5%, and a part which contains dyes and materials which modify glass properties, containing total iron of not more than 0.65 wt %, Se 2-10 PPM, at least one UV absorber selected from CeO₂, V₂O₅, TiO₂ or MoO₃, CoO not more than 20 PPM, Cr₂O₃ not more than 75 PPM, where the redox-ratio of the glass composition is 0.2-0.6.

EFFECT: obtaining neutral grey glass with fundamental wavelength of 480-580 nm and excitation purity of not more than 8%.

20 cl, 4 tbl