US 7,560,403 B2
Clear glass composition with erbium oxide
Ksenia A Landa, Brownstown, Mich. (US); Leonid M. Landa, Brownstown, Mich. (US); Scott V. Thomsen, South Lyon, Mich. (US); and Richard Hulme, Rochester Hills, Mich. (US)
Assigned to Guardian Industries Corp., Auburn Hills, Mich. (US)
Filed on Oct. 17, 2006, as Appl. No. 11/581,779.
Prior Publication US 2008/0090718 A1, Apr. 17, 2008
Int. Cl. C03C 3/095 (2006.01); C03C 3/087 (2006.01)
U.S. Cl. 501—64  [501/70; 501/71] 22 Claims
 
1. Glass comprising:
   
  Ingredient wt. %
   
  SiO2 67-75%
  Na2O 10-20%
  CaO  5-15%
  total iron (expressed as Fe2O3) 0.02 to 0.10%
  erbium oxide 0.02 to 0.15%
  SO3 0.25 to 0.40%
  cerium oxide   0 to 0.08%
   
wherein the glass has visible transmission of at least 90%, a transmissive a* color value of from −0.8 to +0.8, and a transmissive b* color value of −0.8 to +0.9.