Water content%≤0.30
DSS%≤0.30
Melting point癈286-289
Ash content%≤0.03
chroma(in 5% ethanol)Hazen≤15
Heavy metal(base on Pb)PPM≤10
Arsenic(base on As)PPM≤3
Solubility(25癈 g/100g water≥1.0