CAS: 927-80-0 EC No: 213-164-5 MDL No: MFCD00009247 RTECS: KN9900000 UN No: UN1993; Haz Class: 3; Packing Group: II Liquid Molecular Formula: C₄H₆O MW: 70.09 Flash Point: -28°C (-18°F) Density (g/mL): 0.718