| Specification | : | Index(Quality Criterion:HG/T2154/91) Premium Grade 1st Grade Regular Grade
NH4SCN ≥% (dry base) 99.0 98.0 97.0
Clarity test pass
pH 4.5-6.0
Chloride, % ≤ 0.06 0.10 0.10
Sulfate, % ≤ 0.05 0.06 0.10
Residue on ignition, % ≤ 0.08 0.10 0.10
Heavy metal (Pb), % ≤ 0.002 0.002 0.01
Fe, % ≤ 0.0001 0.001 0.005
Sulfide , % ≤ 0.005 0.005 0.01
Water, % ≤ 1.8 2 2
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