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METHYL ETHYL KETONE ICSC: 0179
Date of peer-review: March 1998

Ethyl methyl ketone
2-Butanone
MEK
Methyl acetone
CAS # 78-93-3 C4H8O / CH3COCH2CH3
RTECS # EL6475000 Molecular mass: 72.1
UN # 1193
EC # 606-002-00-3
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Highly flammable.
NO open flames, NO sparks, and NO smoking.
Powder, AFFF, foam, carbon dioxide.
EXPLOSION Vapour/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling. Use non-sparking handtools.
In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE


Inhalation Cough. Dizziness. Drowsiness. Headache. Nausea. Vomiting.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin
Protective gloves.
Remove contaminated clothes. Rinse skin with plenty of water or shower.
Eyes Redness. Pain.
Safety goggles.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Unconsciousness. (Further see Inhalation).
Do not eat, drink, or smoke during work.
Rinse mouth. Give plenty of water to drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. (Extra personal protection: self-contained breathing apparatus).
EU Classification
Symbol: F, Xi
R: 11-36/37
S: (2-)9-16-25-33
UN Classification
UN Hazard Class: 3
UN Pack Group: II
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-88. NFPA Code: H1; F3; R0.
Fireproof. Separated from strong oxidants, strong acids. Cool. Well closed.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2001

SEE IMPORTANT INFORMATION ON BACK


METHYL ETHYL KETONE ICSC: 0179
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

PHYSICAL DANGERS:
The vapour is heavier than air and may travel along the ground; distant ignition possible.

CHEMICAL DANGERS:
Reacts violently with strong oxidants and inorganic acids, causing fire and explosion hazard. Attacks some plastics.

OCCUPATIONAL EXPOSURE LIMITS:
TLV (as TWA): 200 ppm; 590 mg/m^3 ; as STEL: 300 ppm; 885 mg/m^3 (ACGIH 1997). MAK: 200 ppm; 590 mg/m^3; D (1992)
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation and by ingestion.

INHALATION RISK:
A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes and the respiratory tract. The substance may cause effects on the central nervous system. Exposure far above the OEL may result in unconsciousness.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The liquid defats the skin. Animal tests show that this substance possibly causes toxic effects upon human reproduction.
PHYSICAL PROPERTIES
Boiling point: 80C
Melting point: -86C
Relative density (water = 1): 0.8
Solubility in water, g/100 ml at 20C: 29
Vapour pressure, kPa at 20C: 10.5
Relative vapour density (air = 1): 2.41
Relative density of the vapour/air-mixture at 20C (air = 1): 1.1
Flash point: -9C (c.c.)
Auto-ignition temperature: 505C
Explosive limits, vol% in air: 1.8-11.5
Octanol/water partition coefficient as log Pow: 0.29
ENVIRONMENTAL DATA

NOTES
The odour warning when the exposure limit value is exceeded is insufficient.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2001

See Also:
        Methyl ethyl ketone (CHEMINFO)
        Methyl ethyl ketone (EHC 143, 1992)