Item Top Grade First Grade
Appearance White Crystalline Powder White Crystalline Power
Moisture & volatile matter,%,≤ 2.0 3.0
Organic impurities(dry),%, ≤ 4.5 6.5
Purity,%,≥ 95.0 93.0
Chloride,%, ≤ 0.20 0.30
Iron,%,≤ 0.0040 0.0060
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