Specification Test Results

• Assay:
  Min. 98.5 %
• pH (20°C; 5 %):
  4.2 - 5.8
• Heavy metals (as Pb):
  Max. 5 ppm
• Ignition residue (SO₄):
  Max. 0.025 %
• Insolubility in water:
  Max. 50 ppm
• Substances reducing iodine:
  Max. 0.4 %
• Cl (Chloride):
  Max. 50 ppm
• S (Sulphide):
  Max. 10 ppm
• Cu (Copper):
  Max. 4 ppm
• Fe (Iron):
  Max. 1 ppm
• Pb (Lead):
  Max. 4 ppm
• Conforms to Reag. Ph.Eur.:
  Passes test
• SO₄ (Sulphate):
  Max. 100 ppm