Methyl isobutyl ketone.
Vapors cause irritation of nose .
Chemical safety information sheet. If released to soil, MIBK may be removed by direct photolysis on soil surfaces, volatilization, or aerobic biodegradation. This compound is also susceptible to extensive leaching and has been detected in landfill leachate. Chemical hydrolysis is not expected to be environmentally significant. Aerobic biodegradation may be of minor importance.