Methyl isobutyl ketone (MIBK) is an organic solvent. MIBK is among the top ten most popular organic solvents used in industry. MIBK is a stable, colorless liquid with a pleasant odor. Flash point 73°F. Less dense than water. It is both a medium boiling and a medium-evaporating solvent. MIBK finds application as an industrial solvent in various industries.