Glass composition

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

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

Patent

CA 2344159

A high performance green glass composition containing at least 14.5 % by weight Na2O, at least 10.5 % by weight CaO, at least 0.5 % by weight total iron (measured as Fe2O3) and is substantially magnesium-free, the glass thus produced having a ferrous value of at least 30 % and a performance (light transmission minus Direct Solar Heat Transmission) of at least 28 % at at least one thickness of 2.8 mm to 5 mm. The invention also relates to glasses made from such composition and to a laminated glass assembly in which two sheets of glass sandwich a polymeric material, at least one, preferably both, of the sheets of glass having such a composition.

L'invention concerne une composition de verre à bouteille de haute performance. Cette composition contient au moins 14,5 % en poids de Na¿2?O, au moins 10,5 % en poids de CaO, au moins 0,5 % en poids de fer total (mesuré sous forme de Fe¿2?O¿3?) et est sensiblement exempt de magnésium. Le verre ainsi produit présente une valeur ferreuse d'au moins 30 % et une performance (transmission à la lumière moins la transmission de la chaleur solaire directe) d'au moins 28 % à au moins une épaisseur comprise entre 2,8 et 5 mm. L'invention traite également de verres fabriqués à partir de cette composition, et d'un ensemble de verre feuilleté dans lequel deux feuilles de verre sont placées autour d'un matériau polymère. Au moins une feuille, et de préférence les deux feuilles de verre contiennent la composition selon l'invention.

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