CAS: 27610-45-3 EC No: 215-211-5 MDL No: MFCD00149183 UN No: UN1849; Haz Class: 8; Packing Group: II Flakes Molecular Formula: Na₂S·xH₂O MW: 78.04 (anhydrous) Melting Point: 50° (decomposes) Density (g/mL): 1.427