Low light transmission neutral gray glass

Details Low light transmission neutral gray glass Low light transmission neutral gray glass

C - Chemistry, Metallurgy

03

C

261/16

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

Patent

CA 2312899

The invention relates to a glass comprised of silicon, sodium and calcium of neutral grey colour with low light transmission (less than 20 %). The glass reduces the solar energy transmission such as for example the transmission of neat infrared radiation (less than 14 %) and to a large extent the transmission of ultraviolet radiation transmission (less than 12 %). This glass comprises the following components expressed in percentages by weight Fe2O3 between 1.20 and 2.0 %; FeO between 18 and 28 % (reduction percentage); Co3O4 between 0.020 and 0.030 %; selenium between 0.0025 and 0.010 %; CuO between 0.0050 and 0.050 %. The glass of the invention avoids using colorant compounds such as nickel, chromium and manganese.

L'invention concerne une vitre constituée de silicium, de sodium et de calcium de couleur gris neutre qui présente une faible transmission de lumière (moins de 20%). Cette vitre permet de réduire la transmission d'énergie solaire, comme par exemple la transmission de rayonnement infrarouge proche (moins de 14%) et, dans une plus grande mesure, la transmission de rayonnement ultraviolet (moins de 12%). Cette vitre comprend les composants suivants exprimés en pourcentage en poids: Fe2O3 entre 1,20 et 2,0 %, FeO entre 18 et 28 % (pourcentage de réduction), Co3O4 entre 0,020 et 0,030 %, sélénium entre 0,0025 et 0,010 %, CuO entre 0,0050 et 0,050 %. Ainsi, il n'est plus besoin de recourir aux composés colorants tels que le nickel, le chrome et le manganèse.

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