CAS: 1313-82-2 EC No: 215-211-5 MDL No: MFCD00003498 RTECS: WE1905000 UN No: UN1385; Haz Class: 4.2; Packing Group: II Solid Molecular Formula: Na₂S MW: 78.04 Melting Point: 950° Density (g/mL): 1.856