Specification Test Results

• Appearance:
  Green-brown to brown Powder
• Infrared spectrum:
  Conforms
• Melting point:
  193 to 199 °C
• HPLC:
  ≥96.0 %
• Impurity:
  ≤0.1 % (beta-Naphthylamine)
• UV:
  at 280 nm A: ≤0.035
• Chloride (Cl):
  ≤0.01 %
• Sulfate (SO4):
  ≤0.03 %
• Arsenic (As):
  ≤0.0001 %
• Copper (Cu):
  ≤0.005 %
• Iron (Fe):
  ≤0.005 %
• Nickel (Ni):
  ≤0.005 %
• Heavy metals (as Pb):
  ≤20 ppm