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SiO2 : 99.5 % up Fe2O2 : less than 0.010 ( 100 ppm ) max 0.012 Moisture ( MC ) : 5% - 8% Mesh 25 : less than 0.50% Mesh 30 - 140 : less than 99.50% avg Mesh 50 - 70 Mesh 150 : 0.00%
