prov:value
| - wherein, M is an alkali metal selected from Na, K, Li, Rb, and Cs and wherein the glass comprises at least 1 weight percent Na2O; and wherein, R is an alkaline earth metal selected from Mg, Ca, Ba, and Sr, wherein the glass is fusion formable and has a strain point of 540?? C. or greater, a coefficient of thermal expansion of 50??10???7 or greater, and having a liquidus viscosity of 150,000 poise
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