| 摘要 |
The invention relates to a coloured soda-lime glass of blue hue, containing more than 2 wt. % of MgO, more than 1.1 wt. % of Fe<SUB>2</SUB>O<SUB>3</SUB>, less than 0.53 wt. % of FeO and less than 0.13 wt. % of MnO<SUB>2</SUB>, and presenting under Illuminant A and for a glass thickness of 4 mm, a transmission factor (TLA 4 ) higher than 15 %, a selectivity (SE 4 ) higher than 1.2 and a dominant wavelength (lambda<SUB>D</SUB>) and a purity of excitation (P) such that they are located in the CIE chromaticity co-ordinate diagram inside a triangle whereof the apices are defined by the point representing the illuminant source C and the points whereof the co-ordinates (lambda<SUB>D</SUB>, P) are ( 490,19 ) and ( 476,49 ) respectively. Said glass is particularly suitable for motor vehicle side windows, rear windows and sun roof.
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