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3-METHYL-2-BUTENAL
ICSC: 1294
Peer-Review Status: 02.04.2009 Validated
3,3-Dimethylacrolein
3-Methylcrotonaldehyde
Senecialdehyde 
CAS #: 107-86-8 UN #: 1989
EINECS #: 203-527-6
    Formula: C5H8O/(H3C)2C=CHCHO
Molecular mass: 84.12

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Flammable.  NO open flames, NO sparks and NO smoking. NO contact with hot surfaces.  Use foam, powder, carbon dioxide. 
EXPLOSION Above 37°C explosive vapour/air mixtures may be formed.  Above 37°C use a closed system, ventilation and explosion-proof electrical equipment. Use non-sparking handtools.  In case of fire: keep drums, etc., cool by spraying with water. 
 
EXPOSURE   AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Cough. Sore throat. Burning sensation in the throat and chest, Drowsiness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Refer immediately for medical attention. 
Skin Redness. Pain. Skin burns. Blisters.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower for at least 15 minutes. Refer immediately for medical attention. 
Eyes Redness. Pain. Blurred vision.  Wear face shield or eye protection in combination with breathing protection.  Rinse with plenty of water (remove contact lenses if easily possible). Refer immediately for medical attention. 
Ingestion Burning sensation in the throat and chest. Nausea. Abdominal pain. Drowsiness.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer immediately for medical attention. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Remove all ignition sources. Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.   
EC Classification
 
UN Classification
UN Hazard Class: 3; UN Pack Group: III 
GHS Classification
Signal: Danger
Flammable liquid and vapour
Toxic if inhaled
Harmful if swallowed
May be harmful in contact with skin
Causes severe skin burns and eye damage
May cause an allergic skin reaction
May cause damage to the respiratory system if inhaled
Harmful to aquatic life 
flam;flamecorrskull;toxiccancer;health haz

EMERGENCY RESPONSE SAFE STORAGE
  Fireproof. Well closed. Separated from strong oxidants. Store in an area without drain or sewer access. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS-TO-YELLOW LIQUID WITH PUNGENT ODOUR. 

Physical dangers
No data. 

Chemical dangers
Reacts with strong oxidants. This generates fire and explosion hazard. 

Occupational exposure limits
TLV not established.
MAK (not established):. 

Routes of exposure
The substance can be absorbed into the body by inhalation of its vapour and by ingestion. 

Inhalation risk
No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20°C. 

Effects of short-term exposure
The substance is corrosive to the skin. The substance is severely irritating to the eyes. The vapour is irritating to the respiratory tract. Exposure could cause lowering of consciousness. 

Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization. The substance may have effects on the respiratory tract. This may result in tissue lesions. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 136°C
Melting point: -20°C
Density: 0.9 g/cm³
Solubility in water, g/100ml at 20°C: 11 (good)
Vapour pressure, kPa at 20°C: 0.75
Relative vapour density (air = 1): 2.9
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01
Flash point: 37°C
Auto-ignition temperature: 145°C
Explosive limits, vol% in air: 1.8-7
Octanol/water partition coefficient as log Pow: 0.53  
The substance is harmful to aquatic organisms. 

NOTES
Prenal is a trade name. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       3-METHYL-2-BUTENAL (JECFA Evaluation)