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Methyl ethyl ketone peroxide (MEKP)

Methyl ethyl ketone peroxide (MEKP)

Methyl ethyl ketone peroxide

From Wikipedia, the free encyclopedia

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, C8H16O4, in 1906.[3] Later studies found that a linear dimer is the most prevalent in the mixture of products typically obtained,[4] and this is the form that is typically quoted in the commercially available material from chemical supply companies.[5]

Dilute solutions of 30 to 60% MEKP are used in industry and by hobbyists as the catalyst which initiates the crosslinking ofunsaturated polyester resins used in glass-reinforced plastic, and casting. For this application, MEKP is dissolved in dimethyl phthalate, cyclohexane peroxide, or diallyl phthalate to reduce sensitivity to shock. Benzoyl peroxide can be used for the same purpose.

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

MEKP, acetone peroxide and HMTD have all been reported to be the explosives used in the alleged 2006 transatlantic aircraft plot.[citation needed]

Methyl ethyl ketone peroxide
MEK peroxide linear dimer.png
Methyl ethyl ketone peroxide Ball and Stick.png
Names
Preferred IUPAC name
2-Hydroperoxy-2-((2-hydroperoxybutan-2-yl)peroxy)butane[citation needed]
Systematic IUPAC name
2-[(2-Hydroperoxybutan-2-yl)peroxy]butane-2-peroxol[citation needed]
Other names
Ketonox

Mepox

Thermacure
Identifiers
1338-23-4 Yes
1759757
ChemSpider 2905622 Yes
EC Number 215-661-2
Jmol 3D model Interactive image
MeSH Methyl+ethyl+ketone+peroxide
PubChem 3672772
UN number 3105
Properties
C8H18O6
Molar mass 210.23 g·mol−1
Appearance Colorless liquid
Density 1.170 g cm−3
Boiling point decomposition beyond 80 °C (176 °F) [2]
soluble[1]
Explosive data
Shock sensitivity High
Detonation velocity 5200 m/s
Hazards
Main hazards Explosive, Toxic
R-phrases R7 R22 R34
S-phrases S3/7 S14 S26 S36/37/39 S45
Flash point 75 °C (167 °F; 348 K)[2]
US health exposure limits (NIOSH):
PEL(Permissible)
none[1]
REL(Recommended)
C 0.2 ppm (1.5 mg/m3)[1]
IDLH (Immediate danger)
N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Methyl ethyl ketone peroxide (MEKP)
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