CAS: 21908-53-2 EC No: 244-654-7 MDL No: MFCD00011045 RTECS: OW8750000 UN No: UN1641; Haz Class: 6.1; Packing Group: II Powder Molecular Formula: HgO MW: 216.59 Melting Point: 500° (decomposes) Density (g/mL): 11.14