Methyl ethyl ketone peroxide (MEKP) is an
organic peroxide, a high explosive similar to
acetone peroxide. MEKP is a colorless, oily liquid whereas acetone peroxide is a white powder at
STP; MEKP is slightly less sensitive to shock and temperature, and more stable in storage. Depending on the experimental conditions, several different adducts of
methyl ethyl ketone and
hydrogen peroxide are known. The first to be reported was a cyclic dimer, C
8H
16O
4, in 1906. Later studies found that a linear dimer is the most prevalent in the mixture of products typically obtained, and this is the form that is typically quoted in the commercially available material from chemical supply companies.