Item Specifications Appearance High Grade First Grade Quality Part purity%≥ 99.3  99.0  98.0  Moisture%≤ 0.5  Ash%≤ 0.03  0.05  0.08  Aqueous solution appearanceaqueous solution qualified Heavy Metal ( Pb）% 0.01    chloride （Cl）% 0.015    sulphate（SO4）% 0.02    ammonium salt（NH4）% 0.001

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