Assay(drying basis):98.0~102.0%
Appearance: white crystalline powder
Light transmittance: ≥95.0%（430nm）
Specification Rotation:－11.5°~－13.5°
Melting Point:194~198℃
Loss on Drying:≤1.0%
Residue on Ignition:≤0.1%
Chloride:≤0.02%
Sulfide:≤4ppm
Heavy metal(Lead):≤10ppm
Ironic Salt:≤10ppm