IPCS INCHEM Home
ISOBUTYRIC ACID
ICSC: 0903
Peer-Review Status: 03.05.2002 Validated
2-Methylpropanoic acid
Dimethylacetic acid
Propionic acid, 2-methyl- 
CAS #: 79-31-2 RTECS #: NQ4375000
UN #: 2529
EC #: 607-063-00-9
EINECS #: 201-195-7
    Formula: C4H8O2 / (CH3)2CHCOOH
Molecular mass: 88.11

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Flammable. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames, NO sparks and NO smoking.  Use alcohol-resistant foam, powder, carbon dioxide. 
EXPLOSION Above 56°C explosive vapour/air mixtures may be formed.  Above 56°C use a closed system, ventilation and explosion-proof electrical equipment.  In case of fire: keep drums, etc., cool by spraying with water. 
 
EXPOSURE   AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
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
PACKAGING & LABELLING
Remove all ignition sources. Collect leaking and spilled liquid in covered containers as far as possible. Wash away remainder with plenty of water.  Do not transport with food and feedstuffs. 
EC Classification
Symbol: Xn; R: 21/22; S: (2) 
UN Classification
UN Hazard Class: 3; UN Subsidiary Risks: 8; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H1; F2; R0.
Transport Emergency Card: TEC (R)-30GFC-III. 
Fireproof. Separated from strong bases and food and feedstuffs. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
The vapour is heavier than air. 

Chemical dangers
The substance is a weak acid. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin 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 eyes, skin and respiratory tract. Corrosive on ingestion. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
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  
The substance is harmful to aquatic organisms. 

NOTES
 

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
       ISOBUTYRIC ACID (JECFA Evaluation)