Diacetyl
Dimethylglyoxal
Dimethyl diketone
2,3-Diketobutane
Butanedione
CH3COCOCH3 / C4H6O2
Molecular mass: 86.1
ICSC # 1168
CAS # 431-03-8
RTECS # EK2625000
UN # 2346
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Highly flammable.
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NO open flames, NO sparks, and NO smoking.
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Powder, alcohol-resistant foam, water spray, carbon dioxide.
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Explosion
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Vapour/air mixtures are explosive.
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Closed system, ventilation, explosion-proof electrical equipment and lighting.
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In case of fire: keep drums, etc., cool by spraying with water.
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Exposure
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PREVENT GENERATION OF MISTS!
STRICT HYGIENE!
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•Inhalation
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Cough.
Drowsiness.
Nausea.
Headache.
Sore throat.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
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•Eyes
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Redness.
Pain.
Burns
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Safety goggles
or eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Sore throat.
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Give one or two glasses of water to drink.
Seek medical attention if you feel unwell
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Spillage Disposal
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Storage
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Packaging & Labelling
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Personal protection: filter respirator for organic gases and particulates adapted to the airborne concentration of the substance
Collect leaking liquid in covered containers.
Absorb remaining liquid in sand or inert absorbent and remove to safe place.
Remove all ignition sources.
Do NOT let this chemical enter the environment.
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Fireproof.
Store in an area without drain or sewer access.
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UN Hazard Class: 3
UN Packing Group: II
Signal: Danger
Flame-Skull
Highly flammable liquid and vapour
Harmful if swallowed
Toxic if inhaled vapour
Causes skin irritation
Causes serious eye irritation
Harmful to aquatic life
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Important Data
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Physical State; Appearance:
GREEN
TO YELLOW
LIQUID
Physical Dangers:
The vapour is heavier than air
and may travel along the ground; distant ignition possible.
Chemical Dangers:
Heating may cause violent combustion or explosion.
Occupational Exposure Limits:
TLV not established.
MAK not established.
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation
and
by ingestion.
Inhalation Risk:
No indication can be given about the rate in which a harmful concentration in the air is reached on evaporation of this substance at 20°C.
Effects of Short-Term Exposure:
The substance
is severely irritating to
the eyes
.
The substance
is irritating to
the skin
and
the respiratory tract
The substance may cause effects on the
central nervous system
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Exposure at high levels could cause lowering of consciousness.
Effects of Long-Term or Repeated Exposure:
The substance may have effects on the lungs
, resulting in
impaired functions
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SEE NOTES
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Physical
Properties
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Boiling point: 88°C
Melting point: -2.4°C
Relative density (water = 1): 1.1
Solubility in water:
at 25 °C
20 g/100 ml
Vapour pressure, kPa at 25°C: 7.6
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Relative vapour density (air = 1): 3
Relative density of the vapour/air-mixture at 20°C (air = 1): 0.99
Flashpoint: 6°C c.c.
Auto-ignition temperature: 365°C
Explosive limits, vol% in air: 2.4-13 vol%
Octanol/water partition coefficient as log Pow: -1.34
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Environmental
Data
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The substance is harmful to aquatic organisms.
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N O T E S
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Workers exposed to this substance in conjunction with other substances have been found to be at an increased risk of bronchiolitis obliterans. However, the evidence is inadequate at this time to conclude that it is this specific substance that is responsible
Health effects of exposure to the substance have not been investigated adequately.
Environmental effects from the substance have not been investigated adequately.
Do NOT take working clothes home.
Transport Emergency Card: TEC (R)-30GF1-I+II
NFPA Code: H2; F3; R0
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ADDITIONAL INFORMATION
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ICSC: 1168
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2,3-BUTANEDIONE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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