Gray glass composition

Details Gray glass composition Gray glass composition

2005-11-02

2010-02-23

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S070000, C501S071000, C428S426000

Reexamination Certificate

active

07666806

ABSTRACT:
A glass composition that includes a base glass composition including: SiO2from 65 to 75 weight percent, Na2O from 10 to 20 weight percent, CaO from 5 to 15 weight percent, MgO from 0 to 5 weight percent, Al2O3from 0 to 5 weight percent, K2O from 0 to 5 weight percent and BaO 0 to 1 weight percent, and a colorant and property modifying portion including total iron from 0.25 to 0.9 weight percent, Cr2O3from 6 PPM to 400 PPM, Er2O3from 0.3 to 3.0 weight percent, and TiO2from 0.1 to 0.8 weight percent, wherein the glass composition has a redox ratio ranging from 0.15 to 0.62.

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