Appearance: White crystalline powder
Assay: Not less than 98.5%
Identification: As stipulated
Specification rotation: -16 to -19
Loss on drying: Not more than 0.5%
Heavy metals: Not more than 20ppm
Chlorides: Not more than 0.02%
Total impurity: Not more than 1.5%
Burning Residual: Not more than 0.1%
Fluorin: Not less than 4.8%
pH: 4.5 to 6.5