Appearance:White to pale yellow crystal or crystalline powder
Melting point:160～164℃
Residue on ignition:≤0.20%
Moisture:≤0.50%
Arsenic:≤3ppm
Lead:≤10ppm
Cadmium:≤1ppm
Mercury:≤1ppm
Heavy metals (as Pb):≤10ppm
Purity:≥99.0%