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ISOBUTYRIC ACIDICSC: 0903
2-Methylpropanoic acid
Dimethylacetic acid
Propionic acid, 2-methyl-
May 2002
CAS #: 79-31-2
UN #: 2529
EC Number: 201-195-7

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Above 56°C explosive vapour/air mixtures may be formed.  NO open flames, NO sparks and NO smoking.  Above 56°C use a closed system, ventilation and explosion-proof electrical equipment.  Use alcohol-resistant 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 PREVENTION FIRST AID
Inhalation Burning sensation. Cough. Sore throat.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Skin burns. Pain.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. 
Eyes Pain. Redness. Severe deep burns.  Wear face shield.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Burning sensation. Shock or collapse.  Do not eat, drink, or smoke during work.  Give one or two glasses of water to drink. Do NOT induce vomiting. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Collect leaking and spilled liquid in covered containers as far as possible. Wash away remainder with plenty of water. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 3; UN Subsidiary Risks: 8; UN Pack Group: III 

STORAGE
Fireproof. Separated from strong bases and food and feedstuffs. 
PACKAGING
Do not transport with food and feedstuffs. 
ISOBUTYRIC ACID ICSC: 0903
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
The vapour is heavier than air. 

Chemical dangers
The substance is a weak acid. 

Formula: C4H8O2 / (CH3)2CHCOOH
Molecular mass: 88.11
Boiling point: 152-155°C
Melting point: -47°C
Relative density (water = 1): 0.95
Solubility in water, g/100ml at 20°C: 20
Vapour pressure, kPa at 14.7°C: 0.13
Relative vapour density (air = 1): 3.0
Flash point: 56°C c.c.
Auto-ignition temperature: 481°C
Explosive limits, vol% in air: 2-9
Octanol/water partition coefficient as log Pow: 0.88  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Effects of short-term exposure
The substance is corrosive to the eyes, skin and respiratory tract. Corrosive on 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 long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
Symbol: Xn; R: 21/22; S: (2) 

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    See Also:
       Toxicological Abbreviations
       ISOBUTYRIC ACID (JECFA Evaluation)