Names
Preferred IUPAC name: Butan-2-one
Other names
Ethyl methyl ketone
Methyl ethyl ketone ()
MEK
2-Butanone
Methylpropanone
Ethylmethylketone
Methylacetone
Identifiers
CAS Number: 78-93-3
JSmol: Interactive image
Beilstein Reference: 741880
ChEBI: CHEBI:28398
ChEMBL: ChEMBL15849
ChemSpider: 6321
ECHA InfoCard: 100.001.054
Gmelin Reference: 25656
KEGG: C02845
PubChem: 6569
RTECS number: EL6475000
UNII: 6PT9KLV9IO
Properties
Chemical formula: C4H8O
Molar mass: 72.11 g·mol
Appearance: Colorless liquid
Odor: mint or acetone-like
Density: 0.8050 g/mL
Melting point: −86 °C (−123 °F; 187 K)
Boiling point: 79.64 °C (175.35 °F; 352.79 K)
Solubility in water: 27.5 g/100 mL
Vapor pressure: 78 mmHg (20°C)
K: 14.7
Magnetic susceptibility: -45.58·10 cm/mol−63
Refractive index: 1.37880
Viscosity: cP
Structure
Dipole moment: D
Hazards
Safety data sheet: See:
EU classification: F
R-phrases: R11 R36 R66 R67
S-phrases: (S2) S9 S16
NFPA 704:
Flash point: −9 °C (16 °F; 264 K)
Autoignition
temperature: 505 °C (941 °F; 778 K)
Explosive limits: 1.4%-11.4%
LD
median dose: 2737 mg/kg (oral, rat)
4050 mg/kg (oral, mouse)
median concentration: 12667 ppm (mammal)
13333 ppm (mouse, 2 hr)
7833 ppm (rat, 8 hr)
NIOSH
PEL: TWA 200 ppm (590 mg/m)3
REL: TWA 200 ppm (590 mg/m) ST 300 ppm (885 mg/m)33
IDLH: 3000 ppm
Related compounds
Ketones: Acetone
Supplementary data page
Structure and
properties: n
Thermodynamic
data: Phase behaviour
Spectral data: UV
Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).
