Specification Test Results

• Assay (Fe(NH₄)₂(SO₄)₂·6H₂O) (by KMnO₄ titrn):
  98.5 - 101.5 %
• Insoluble Matter:
  ≤0.01 %
• pH of 5% Solution at 25°C:
  3.0 - 5.0
• Chloride (Cl):
  ≤0.001 %
• Phosphate (PO₄):
  ≤0.003 %
• Calcium (Ca):
  ≤0.005 %
• Copper (Cu):
  ≤0.003 %
• Ferric Ion (Fe³⁺):
  ≤0.01 %
• ACS - Magnesium (Mg):
  ≤0.002 %
• Manganese (Mn):
  ≤0.01 %
• Potassium (K):
  ≤0.002 %
• Sodium (Na):
  ≤0.02 %
• Zinc (Zn):
  ≤0.003 %