Patent ID: 8671717

Claim:
A method of making a low-iron highly transmissive glass for use in a photovoltaic device, the glass comprising: Ingredient wt. % SiO 2 67-75% Na 2 O 10-20% CaO 5-15% total iron (expressed as Fe 2 O 3 ) 0.001 to 0.05% cerium oxide 0 to 0.07% antimony oxide 0.01 to 1.0% lithium oxide 0.25 to 3.5% salt cake 0.30 to 0.40% wherein the glass has visible transmission of at least 90%, a transmissive a* color value of −1.0 to +1.0 and a transmissive b* color value of from 0 to +1.5; and wherein the method comprises providing the lithium oxide, antimony oxide and salt cake in the recited amounts in a batch in making the low-iron glass so that a seed free time in making the glass is no more than 100 minutes, and wherein the batch has a batch redox of from +30 to +40.