CAS: 7440-46-2 EC No: 231-155-4 MDL No: MFCD00134037 RTECS: FK9225000 UN No: UN1407; Haz Class: 4.3; Packing Group: I Solid, vacuum sealed in breakseal ampules Molecular Formula: Cs MW: 132.91 Melting Point: 28.5° Boiling Point: 705° Density (g/mL): 1.873