Grey glass compositions of the soda-lime type

Details Grey glass compositions of the soda-lime type Grey glass compositions of the soda-lime type

C - Chemistry, Metallurgy

03

C

C03C 3/087 (2006.01) C03C 4/02 (2006.01) C03C 4/08 (2006.01)

Patent

CA 2398693

The invention concerns a grey glass composition of the soda-lime type having a global light transmission under an illuminant A (T¿LA?) more than 15 % for a glass thickness equal to 4.85 mm, said composition comprising colouring agents as follows in the following weight percentage limits: Fe¿2?O¿3?: 0.25-0.65 %, preferably 0.3-0.6 % and more preferably still 0.3-0.4 %; CoO: 150-250 ppm and preferably > 185 ppm; NiO: 650-1000 ppm; Se < 5 ppm.

L'invention a pour but une composition de verre gris de type silico-sodo- calcique présentant une transmission lumineuse globale sous illuminant A (TLA) supérieure à 15 % pour une épaisseur de verre égale à 4,85 mm, ladite composition comportant les agents colorants ci-après dans les limites pondérales suivantes: Fe2O3 0,25-0,65 %, de préférence 0,3-0,6 % et mieux encore 0,3-0,4 %; CoO 150-250 ppm et de préférence > 185 ppm; NiO 650-1000 ppm; Se < 5 ppm.

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