Methyl ethyl ketone peroxide

  • 2-Butanone peroxide
  • Ethyl methyl ketone peroxide
  • Methyl ethyl ketone hydroperoxide
  • MEKP
Formula
C8H16O4
Structure
Description
Colorless liquid.
Uses
Manufacture of acrylic resins, hardening agent for fiberglass-reinforced plastics.

Registry Numbers and Inventories.
CAS
1338-23-4
EC (EINECS/ELINCS)
215-661-2
RTECS
EL9450000
RTECS class
Tumorigen; Human Data; Primary Irritant
UN (DOT)
2550
Beilstein/Gmelin
1680216
Beilstein Reference
5-19-11-00335
RCRA
U160
Swiss Giftliste 1
G-2430
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H16O4
Formula mass
176.24
Melting point, °C
110
Decomposition point, °C
118
Vapor density (air=1)
6.08
Density
1.170 g/cm3 (20 C)
Solubility in water
Soluble

Hazards and Protection.
Storage
Storage temperature- -18 to 29 C. Separate storage away from flammables, strong oxidizing and reducing agents, in particular, promoters such as cobalt compounds. Never store in refrigerators containing food and drink. Store at only in original containers. Do not return material to original containers. Post no smoking and flammable storage to keep fires away signs.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Apply water spray or mist to knock down vapors. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash, cement powder, or commercial sorbents. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Remove trapped material with suction hoses.
Stability
Self-accelerating decomposition temperature of 40% dimethyl phthalate solution, 63 C. Explosive decomposition at 110 C. Shock and heat sensitive. Dangerous when exposed to heat and flames. MEK peroxide can exist in several different structures, some of which are extremely shock sensitive even at 60% concentration. MEK peroxide can be decomposed by heat and sunlight and many chemicals. Spontaneous chemical reaction, ignition, and/or explosion may occur if mixed with readily oxidizable, organic, or flammable materials or chemical accelerants. container may explode in heat of fire. May explode from heat or contamination. Solutions containing up to 60% peroxide may explode from friction or shock. Runoff to sewer may create fire or explosion hazard.
Incompatibilities
Sensitive to sunlight If mixed with readily oxidizable materials Reacts with combustible materials such as wood, cloth or organic materials, with chlorine, and with metals (iron, copper and their alloys and aluminum and its alloys) Incompatible with strong oxidizing agents, strong reducing agents, natural rubbers, synthetic rubbers and chemical accelerators Incompatible with heavy metals, acids and bases.
Decomposition
Oxides of carbon.

Fire.
Flash Point,°C
82
Autoignition, °C
555
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Keep run-off water out of sewers and water sources.
Fire potential
Moderately flammable. Organic peroxides are highly flammable and easily ignited. Fires involving them may be large, rapidly burning, fast moving, and punctuated frequently by explosions.
Hazards
Explosive.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
2
 
 
Reactivity
4
 
 
Special
O

Health.
Exposure limit(s)
NIOSH REL: C 0.2 ppm (1.5 mg/m3)
Poison_Class
2
Exposure effects
Coma occurred 30 minutes after ingestion of mekp in one case.
   Ingestion
Burns of the esophagus and less commonly the stomach may occur after caustic ingestion; the absence of oral mucosal injury does not reliably exclude esophageal burns. Patients with stridor, drooling or vomiting are more likely to have esophageal burns.
   Inhalation
Stridor, dyspnea, upper airway injury, and pulmonary edema, especially following inhalation of vaporized caustics, may occur.
   Skin
Severe skin irritation and/or burns may occur.
   Eyes
Ingestion may result in burns to the lips, tongue, oral mucosa, and upper airway. Alkaline eye exposures produce distortion of cellular membranes, loss of corneal, the mucous membrane that lines the inner surface of the eyelid and the exposed surface of the eyeballl and lens epithelium and loss of endothelium of the cornea and blood vessels.

First aid
 
   Ingestion
DO NOT INDUCE VOMITING. Corrosive chemicals will destroy the membranes of the mouth, throat, and esophagus and, in addition, have a high risk of being aspirated into the victim's lungs during vomiting which increases the medical problems. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. IMMEDIATELY transport the victim to a hospital. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. Transport the victim IMMEDIATELY to a hospital.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
2550
Response guide
Hazard class
5.2
USCG CHRIS Code
BNP
 
Std. Transport #
4961160