| http://www.w3.org/ns/prov#value | - filler including tin oxide and a material selected from the group consisting of alkali metal oxides, alkali metal hydroxides, and combinations thereof; said particulate filler having a total concentration in said layer of from about 25 to 50 percent of the total volume of said layer, said tin oxide having a concentration of from 20 to 40 percent of the total volume of said layer. 2.
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