Methyl Ethyl Ketone Peroxide
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Methyl Ethyl Ketone Peroxide

Methyl ethyl ketone peroxide
MEK peroxide linear dimer.png
Preferred IUPAC name
Other names
  • 1338-23-4 checkY
3D model (JSmol)
ECHA InfoCard 100.014.238 Edit this at Wikidata
EC Number
  • 215-661-2
MeSH Methyl+ethyl+ketone+peroxide
UN number 3105
  • InChI=1S/C8H18O6/c1-5-7(3,11-9)13-14-8(4,6-2)12-10/h9-10H,5-6H2,1-4H3 ?N
Molar mass  g·mol-1
Appearance Colorless liquid
Density 1.170 g cm-3
Boiling point Decomposition beyond 80 °C (176 °F) [2]
Explosive data
Shock sensitivity High
Detonation velocity 5200 m/s
RE factor 0.9
Main hazards Explosive, Toxic
GHS pictograms GHS01: Explosive GHS07: Harmful GHS08: Health hazard
GHS Signal word Danger
H202, H205, H241, H300, H315, H318, H335
P102, P220, P243, P250, P261, P264, P280, P283, P370+380, P372, P404
NFPA 704 (fire diamond)
Flash point 75 °C (167 °F; 348 K)[2]
NIOSH (US health exposure limits):
PEL (Permissible)
REL (Recommended)
C 0.2 ppm (1.5 mg/m3)[1]
IDLH (Immediate danger)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
?N verify (what is checkY?N ?)
Infobox references

Methyl ethyl ketone peroxide (MEKP) is an organic peroxide with the formula [(CH3)(C2H5)C(O2H)]2O2. MEKP is a colorless, oil. It is widely used in vulcanization (crosslinking) of polymers.[3]

It is derived from the reaction of methyl ethyl ketone and hydrogen peroxide. Several products result from this reaction including a cyclic dimer.[4] The linear dimer, the topic of this article, is the most prevalent.[5] and this is the form that is typically quoted in the commercially available material.[6]

Solutions of 30 to 40% MEKP are used in industry and by hobbyists as catalyst to initiate the crosslinking of unsaturated polyester resins used in fiberglass, and casting. For this application, MEKP often is dissolved in dimethyl phthalate, cyclohexane peroxide, or diallyl phthalate to reduce sensitivity to shock. Benzoyl peroxide can be used for the same purpose.


Whereas acetone peroxide is a white powder at STP MEKP is slightly less sensitive to shock and temperature, and more stable in storage.

MEKP is a severe skin irritant and can cause progressive corrosive damage or blindness.

See also


  1. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0416". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ a b Record of 2-Butanone peroxide in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 10 March 2013.
  3. ^ Klenk, Herbert; Götz, Peter H.; Siegmeier, Rainer; Mayr, Wilfried (2000). "Peroxy Compounds, Organic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_199.
  4. ^ Pastureau, P. (1907). "Le superoxyde de la méthyléthylcétone". Comptes Rendus. 144 (2): 90-93.
  5. ^ Milas, N. A.; Golubovi?, A. (1959). "Studies in Organic Peroxides. XXV. Preparation, Separation and Identification of Peroxides Derived from Methyl Ethyl Ketone and Hydrogen Peroxide". Journal of the American Chemical Society. 81 (21): 5824-5826. doi:10.1021/ja01530a068.
  6. ^ "2-Butanone peroxide". Sigma-Aldrich. Retrieved 2011.

External links

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



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