Properties Value Synonym Amido Sulphonic Acid CAS No. 5329 -14 -6 Chemical Formula H3NO3S Molecular Weight 97.09 Physical Appearance White Crystalline Powder Purity 99.0% min. Moisture 0.5% max. Melting Point 2050 C Vapour Density 3.3 Sulphate 0.1% Iron as Fe < 50 ppm Ammonical Nitrogen as NH4HSO4 0.15% max. UN No. 2967 Hazard Class 8 Packing Group III