Synonyms: Sodium isothiocyanate, Sodium rhodanate, Sodium rhodanide, Sodium sulfocyanate CAS: 540-72-7 Molecular Formula: NaSCN Molecular Weight: 81.07 g/mol Test Specification Description Colorless to white crystals Assay 98.0% min. Insoluble matter 0.005% max. Chloride (Cl) 0.01% max. Iron (Fe) 2 ppm max. Heavy Metals (as Pb) 5 ppm max. Sulfide 0.001% max. Sulfate (SO4) 0.01% max. Ammonium (NH4) 0.002% max. Carbonate (as Na2CO3) 0.2% max.