CAS: 7440-21-3 EC No: 231-130-8 MDL No: MFCD00085311 RTECS: VW0400000 UN No: UN1346; Haz Class: 4.1; Packing Group: III Powder, S.A. 70-100 m 2 /g Molecular Formula: Si MW: 28.09 Melting Point: 1410° Boiling Point: 2355° Density (g/mL): 2.33