Description White to off-white crystalline powder, odorless. Identification A. IRB. UV Solubility Soluble in ethanol. Very slightly soluble in water Moisture 2.0%max Sulphated ash 0.5% max Heavy metals 20 ppm max Pyridine 500 ppm max Thiamine disulfide 1.0% max Assay(on dry basis) 98.5%-101.0% Purity(HPLC) 98.0% min