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Methyl Ethyl Ketone (MEK)
 
DOT ID:
ETHYL METHYL KETONE  3  UN1193  PG: II  FLAMMABLE LIQUID
 
C.A.S. Number: 78-93-3
 
ETHYL METHYL KETONE
 
  • FLAMMABLE LIQUID
 
 
NFPA 704:
  • Red 3      -- Flammability: Ignites at normal temperatures
  • Blue 1      -- Health Hazard: Slightly hazardous
  • Yellow 0   -- Reactivity: Normally stable
 
General Description
Colorless fairly volatile liquid with a pleasant pungent odor. Flash point 20°F. Vapors heavier than air. Does not react with water or many common materials. Stable in normal transportation. Irritates the nose, eyes, and throat. Combustion may produce toxic materials. Density 6.7 lb / gal. Used as a solvent, for making other chemicals, and for production of wax from petroleum.
 
 
Hazards
What is this information? Reactivity Alerts - Special alerts if the chemical is especially Reactivity Alerts
 
  • Highly Flammable
 
Air & Water Reactions
 
Highly flammable. Soluble in water.
 
Fire Hazard
 
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water. (ERG, 2008)
 
Health Hazard
Liquid causes eye burn. Vapor irritates eyes, nose, and throat; can cause headache, dizziness, nausea, weakness, and loss of consciousness. (USCG, 1999)
 
Reactivity Profile
ETHYL METHYL KETONE is explosive in the form of vapor when exposed to heat, flame or sparks. Ignition on contact with potassium tert-butoxide. Reactive with strong oxidizing materials, and will dissolve or soften some plastics. Mixture with 2-propanol will form explosive peroxides during storage. Vigorous reaction with chloroform in the presence of alkali (sodium hydroxide, potassium hydroxide), chlorosulfonic acid, fuming sulfuric acid (oleum) [Lewis, 3rd ed., 1993, p. 855]. Reaction with hydrogen peroxide in the presence of nitric acid forms heat- and shock-sensitive explosive acetone peroxides. [Bjorklund, G. H. et al., Trans. R. Soc. Can, 1950, 44, p. 25].
 
Belongs to the Following Reactive Group(s)
 
 
 
Firefighting
 
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may be ineffective. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use "alcohol" foam, dry chemical or carbon dioxide. (AAR, 2003)
 
Non-Fire Response
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to disperse vapors and dilute standing pools of liquid. Apply water spray or mist to knock down vapors. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. 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. (AAR, 2003)
 
Protective Clothing
Skin: Wear appropriate personal protective clothing to prevent skin contact.

Eyes: Wear appropriate eye protection to prevent eye contact.

Wash skin: The worker should immediately wash the skin when it becomes contaminated.

Remove: Work clothing that becomes wet should be immediately removed due to its flammability hazard(i.e. for liquids with flash point < 100°F)

Change: No recommendation is made specifying the need for the worker to change clothing after the work shift.

Provide: Eyewash fountains should be provided in areas where there is any possibility that workers could be exposed to the substance; this is irrespective of the recommendation involving the wearing of eye protection. (NIOSH, 2003) Copyrighted information of E.I. du Pont de Nemours and Company. Tychem® is a registered trademark of E.I. du Pont de Nemours and Company.
 
First Aid
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.

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.

INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used; if not available, use a level of protection greater than or equal to that advised under Protective Clothing.

INGESTION: DO NOT INDUCE VOMITING. Volatile chemicals 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. IMMEDIATELY transport the victim to a hospital. (NTP, 1992)
 
Molecular Formula:
  • C4H8O
 
Flash Point:                          26.0 ° F (NTP, 1992)
Lower Explosive Limit:              1.8 % (NTP, 1992)
Upper Explosive Limit:             10.0 % (NTP, 1992)
Autoignition Temperature:      961.0 ° F (USCG, 1999)
Melting Point:                     -123.3 ° F (NTP, 1992)
Vapor Pressure:                     77.5 mm Hg at 68.0 ° F ;
                                         100.0 mm Hg at 77.0° F (NTP, 1992)
Vapor Density:                        2.42 (NTP, 1992)
Specific Gravity:                      0.806 at 68.0 ° F (USCG, 1999)
Boiling Point:                        175.3 ° F at 760 mm Hg (NTP, 1992)
Molecular Weight:                   72.11 (NTP, 1992)
Water Solubility:                   greater than or equal to 100 mg/mL at 66° F (NTP, 1992)
AEGL:                                 data unavailable
ERPG:                                 data unavailable
TEEL-1          TEEL-2                  TEEL-3
200.0 ppm     2700.0 ppm            4000.0 ppm                   (SCAPA, 2008)
IDLH:           3000.0 ppm                                               (NIOSH, 2003)
 
Regulatory Names:
  • METHYL ETHYL KETONE (MEK)
  • METHYL ETHYL KETONE
 
CAA RMP:                   Not a regulated chemical.
CERCLA:                     Regulated chemical with a Reportable Quantity
                                of 5000 pounds.
EHS (EPCRA 302):        Not a regulated chemical.
TRI (EPCRA 313):         Regulated chemical.
RCRA Chemical Code:    U159
 
 Alternate Chemical Names
 
  • 2-BUTANONE
  • 3-BUTANONE
  • BUTANONE
  • ETHYL METHYL KETONE {METHYL ETHYL KETONE}
  • ETILMETILCETONA (DOT SPANISH)
  • KETONE, ETHYL METHYL
  • MEETCO
  • MEK
  • METHYL ACETONE
  • METHYL ETHYL KETONE
  • METHYL ETHYL KETONE (MEK)
  • METIL ETIL CETONA (DOT SPANISH)
  • MÉTHYLÉTHYLCÉTONE (DOT FRENCH)
  • RCRA WASTE NUMBER U159
  • UN 1193
  • UN 1232
  • ÉTHYLMÉTHYLCÉTONE (DOT FRENCH)
 
 
 
Information obtained from:
Cameo Chemicals
Emergency Response Division, Office of Response and Restoration. National Ocean Service, National Oceanic and Atmospheric Administration
 
July 29, 2011