NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Methyl ethyl ketone peroxide

CAS
1338-23-4

C8H16O4

RTECS
EL9450000
Synonyms & Trade Names

2-Butanone peroxide, Ethyl methyl ketone peroxide, MEKP, MEK peroxide, Methyl ethyl ketone hydroperoxide
DOT ID & Guide

Exposure
Limits

NIOSH REL: C 0.2 ppm (1.5 mg/m3)
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
1 ppm = 7.21 mg/m3
Physical Description
Colorless liquid with a characteristic odor. [Note: Explosive decomposition occurs at 230°F.]
MW: 176.2
BP: 244°F (Decomposes)
FRZ: ?
Sol: Soluble
VP: ?
IP: ?

Sp.Gr(59°F): 1.12
Fl.P(oc): 125-200°F (60% MEKP)
UEL: ?
LEL: ?

Combustible Liquid
Incompatibilities & Reactivities

Organic materials, heat, flames, sunlight, trace contaminants [Note: A strong oxidizing agent. Pure MEKP is shock sensitive. Commercial product is diluted with 40% dimethyl phthalate, cyclohexane peroxide, or diallyl phthalate to reduce sensitivity to shock.]
Measurement Methods
NIOSH 3508; OSHA 77
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash, Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin, nose, throat; cough, dyspnea (breathing difficulty), pulmonary edema; blurred vision; blisters, scars skin; abdominal pain, vomiting, diarrhea; dermatitis; in animals: liver, kidney damage
Target Organs
Eyes, skin, respiratory system, liver, kidneys
See also: INTRODUCTION