Appearance White or almost crystalline powder Specific rotation[α]20/D (C=8 in 6N HCl) +25°to +27° Chloride (Cl) Not more than 0.05% Sulfate (SO4) Not more than 0.03% Heavy metal(Pb) Not more than 20ppm Ammonium(NH4) Not more than 0.02% Loss on drying Not more than 3.0% Residue on ignition(sulfated) Not more than 0.1% Assay 98.5% to 101.0% PH 5.5 to 7.0