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butane-2,2-diyl dihydroperoxide (monomer)
Methyl ethyl ketone peroxide, MEKP, MEK Peroxide
3D model (JSmol)
|Molar mass||122.12 g mol-1 (monomer)
210.22 g mol-1 (dimer)
|Appearance||Colorless, high-viscosity liquid|
|Melting point||-8 °C|
|Boiling point||110-117.8 °C (decomposes)|
|Vapor pressure||<0.01 mmHg at 20 °C|
|Main hazards||Strong Oxidizer, Explosive, Toxic|
|S-phrases (outdated)||S3/7, S14, S36/37/39, S45, S50|
|Flash point||82 °C|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
- Tracking categories (test):
Methyl ethyl ketone peroxide (MEKP) is an organic peroxide similar to acetone peroxide. MEKP is a colorless, oily liquid with an odor similar to that of acetone. MEKP is a strong oxidizer and a severe irritant. Pure MEKP is shock sensitive, and is therefore diluted for commercial and industrial use as a catalyst for the room temperature polymerization of polyester resins.
Commercially available MEKP is a mixture of two different forms: the monomer, C4H10O4, and the dimer, C8H18O6. It may also exist as a cyclic dimer (with the formula C8H16O4), as well as higher cyclic oligomers.
Methyl ethyl ketone peroxide is produced by the reaction between butanone and hydrogen peroxide. Temperature and the use of a catalyst such as nitric, sulfuric, or hydrochloric acid will affect the resulting yield of each oligomer.
To prevent detonation, MEKP is diluted