CAS: 2919-23-5 EC No: 220-858-1 MDL No: MFCD00001318 UN No: UN1120; Haz Class: 3; Packing Group: II Liquid Molecular Formula: C₄H₈O MW: 72.11 Boiling Point: 123°/733 mmHg Flash Point: 31°C (70°F) Density (g/mL): 0.921 Refractive Index: 1.435