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3-METHYL-2-BUTENALICSC: 1294
April 2009
CAS #: 107-86-8Senecialdehyde
3,3-Dimethylacrolein
3-Methylcrotonaldehyde
UN #: 1989
EINECS #: 203-527-6

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable.  Above 37°C explosive vapour/air mixtures may be formed.  NO open flames, NO sparks and NO smoking. NO contact with hot surfaces.  Above 37°C use a closed system, ventilation and explosion-proof electrical equipment. Use non-sparking handtools.  Use foam, powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS ACUTE HAZARDS FIRST AID
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 CLASSIFICATION & 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. 

According to UN GHS Criteria

flam;flamecorrskull;toxiccancer;health haz
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 

Transportation
UN Classification
UN Hazard Class: 3; UN Pack Group: III 

STORAGE
Fireproof. Well closed. Separated from strong oxidants. Store in an area without drain or sewer access. 
PACKAGING
 
3-METHYL-2-BUTENAL ICSC: 1294
PHYSICAL & CHEMICAL INFORMATION

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. 

Formula: C5H8O/(H3C)2C=CHCHO
Molecular mass: 84.12
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  


EXPOSURE & HEALTH EFFECTS

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

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. 

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 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. 


Occupational exposure limits
 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
 

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