Item Index grade Super product Superior grade product First grade product Qualified product
Appearance White crystal White crystal White crystal
Or with color With color crystal
Moisture content and volatile, %, ≤ 1.0 2.0 3.0 5.0
Organic impurities(dry base), %, ≤ 2.0 3.0 5.0 8.0
Sodium formate (dry base), %, ≥ 97.0 95 92.0 90
Chloride(dry base), %, ≤ 1.0 1.0 2.0 3.0
Iron content(dry base), %, ≤ 0.02 0.05 0.08 0.10