US 7,582,582 B2
Composition for gray silica-sodium calcic glass for producing glazing
Laurent Teyssedre, Paris (France)
Assigned to Saint-Gobain Glass France, Courbevoie (France)
Appl. No. 10/542,925
PCT Filed Jan. 22, 2004, PCT No. PCT/FR2004/000150
§ 371(c)(1), (2), (4) Date Nov. 17, 2005,
PCT Pub. No. WO2004/067461, PCT Pub. Date Aug. 12, 2004.
Claims priority of application No. 03 01164 (FR), filed on Jan. 24, 2003.
Prior Publication US 2006/0240969 A1, Oct. 26, 2006
Int. Cl. C03C 3/087 (2006.01)
U.S. Cl. 501—71  [501/70] 23 Claims
 
1. A gray soda-lime silicate glass composition, comprising the following coloring agents with contents varying within the following weight limits:
   
  Fe2O3 (total iron) 0.01 to 0.14%;
  CoO 40 to 150 ppm; and
  NiO 200 to 700 ppm;
   
wherein:
the NiO/CoO weight ratio is between 3.5 and 6; and
the glass has an overall light transmission (TLD65) under illuminant D65 of between 20 and 60% measured at a thickness of 6 mm.