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NIOSH

2,3-BUTANEDIONE

ICSC: 1168

Diacetyl
Dimethylglyoxal
Dimethyl diketone
2,3-Diketobutane
Butanedione
CH3COCOCH3 / C4H6O2
Molecular mass: 86.1
ICSC # 1168 		CAS # 431-03-8
RTECS # EK2625000
UN # 2346
November 23, 2007 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Highly flammable.
NO open flames, NO sparks, and NO smoking.
Powder, alcohol-resistant foam, water spray, carbon dioxide.
EXPLOSION Vapour/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting.
In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE
PREVENT GENERATION OF MISTS! STRICT HYGIENE!

•INHALATION Cough. Drowsiness. Nausea. Headache. Sore throat.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
•SKIN Redness.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower.
•EYES Redness. Pain. Burns
Safety goggles or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
•INGESTION Sore throat.
Do not eat, drink, or smoke during work.
Rinse mouth. Give one or two glasses of water to drink. Seek medical attention if you feel unwell

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

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.
Fireproof. Store in an area without drain or sewer access.

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
ICSC: 1168 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

2,3-BUTANEDIONE

ICSC: 1168

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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.


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 . 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 . SEE NOTES

PHYSICAL
PROPERTIES

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
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

ENVIRONMENTAL
DATA

The substance is harmful to aquatic organisms.

N O T E S

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

ADDITIONAL INFORMATION



ICSC: 1168 2,3-BUTANEDIONE
(C) IPCS, CEC, 1994
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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