Dark gray, infrared absorbing glass composition and product

Details Dark gray, infrared absorbing glass composition and product Dark gray, infrared absorbing glass composition and product

C - Chemistry, Metallurgy

03

C

C03C 3/076 (2006.01) C03C 1/10 (2006.01) C03C 3/087 (2006.01) C03C 4/02 (2006.01) C03C 4/08 (2006.01) C03C 17/23 (2006.01)

Patent

CA 2052142

A neutral, dark gray, soda-lime-silica glass having luminous transmittance less than 32 percent, infrared transmittance less than 15 percent, and total solar energy transmittance less than 20 percent (all at 3.9 millimeter thickness) is produced with colorants consisting essentially of 1.0 to 1.7 percent by weight total iron, at least 0.27 percent FeO, 0.01 to 0.02 percent CoO, and 0.002 to 0.005 percent Se and with avoidance of constituents that may cause difficulty in manufacturing or in subsequent use of the glass such as nickel, chromium, manganese, and titanium. The flat glass product having such a composition is particularly suitable for use as privacy glazing of the type used for automotive glazing. The use of the glass as a substrate for a reflectively coated product is also disclosed.

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