Neutral, ultraviolet absorbing, fixed tint glasses

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 4/08 (2006.01) C03C 1/10 (2006.01) C03C 3/078 (2006.01) C03C 3/089 (2006.01) C03C 3/093 (2006.01) C03C 4/02 (2006.01)

Patent

CA 2108587

A transparent glass which, at a thickness of 2 mm, does not transmit more than about 1% of ultraviolet radiation at a wavelength of 380 nm and exhibits a neutral gray, fixed tint bounded by apices A, B, C, D, A of the drawing, a purity no higher than 6, and a luminous transmittance between 10-16, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of SiO2 65-72 CaO 0-1.5 B2O3 2-6 Al2O3+caO 0.2-2.25 Na2O 6-10 AS2O3 0-0.3 K2O 10-16 Fe2O3 4.8-6.2 Na2O+K2O 17-23 CO3O4 0.012-0.02 K2O:Na2O 1.25-2.25 NiO 0.16-0.21 A12O3 0-2.25 ZnO 0-1.5.

Un verre transparent qui, à une épaisseur de 2 mm, ne transmet pas plus d'environ 1 % du rayonnement ultraviolet à une longueur d'onde de 380 nm, qui présente une teinte fixée gris neutre, délimitée par les sommets A, B, C, D, A du dessin, une pureté n'excédant pas 6 et une transmission de la lumière variant entre 10 et 16; le verre en question présente une composition qui est essentiellement la suivante, exprimée en pourcentage en poids, par rapport à l'oxyde : SiO2 65-72 CaO 0-1,5 B2O3 2-6 Al2O3+CaO 0,2-2,25 Na2O 6-10 AS2O3 0-0,3 K2O 10-16 Fe2O3 4,8-6,2 Na2O+K2O 17-23 CO3O4 0,012-0,02 K2O:Na2O 1,25-2,25 NiO 0,16-0,21 A12O3 0-2,25 ZnO 0-1,5.

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