CAS: 1327-53-3 EC No: 215-481-4 MDL No: MFCD00003433 RTECS: CG3325000 UN No: UN1561; Haz Class: 6.1; Packing Group: II -100 Mesh Powder Molecular Formula: As₂O₃ MW: 197.84 Boiling Point: 465° (sublimes)