Methyl isobutyl ketone is the organic compound with the formula (CH₃)₂CHCH₂CCH₃. This colourless liquid, a ketone, is used as a solvent for gums, resins, paints, varnishes, lacquers, and nitrocellulose.

Methyl isobutyl ketone (MIBK) is a clear, colourless organic liquid compound. MIBK is used as a chemical intermediate, a solvent for manufacturing paints, rubbers, pharmaceuticals, other chemicals, and industrial cleaners. It is used in the semiconductor industry. MIBK is very efficient at dissolving resins used in paints, inks, lacquers, and other types of surface coatings.

Synonyms:- Isobutyl methyl ketone, 4-Methylpentan-2-one, 4- methyl-2-pentanone

CAS number:- 108-10-1