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CROTONIC ACIDICSC: 0423
(2E)-But-2-enoic acid
trans-2-Butenoic acid
trans-Crotonic acid
May 2018
CAS #: 107-93-7
UN #: 2823
EC Number: 203-533-9

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible.  Risk of fire and explosion on contact with incompatible substances. See Chemical Dangers. Above 88°C explosive vapour/air mixtures may be formed.  NO open flames. NO contact with incompatible substances. See Chemical Dangers.  Above 88°C use a closed system and ventilation.  Use water spray, foam, dry powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

   
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Sore throat.  Use local exhaust or breathing protection.  Fresh air, rest. Seek medical attention if you feel unwell. 
Skin Redness.  Protective gloves.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention if skin irritation occurs. 
Eyes Redness. Pain. Burning sensation. Burns.  Wear safety goggles or face shield.  Rinse with plenty of water for several minutes (remove contact lenses if easily possible). Refer immediately for medical attention. 
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 CLASSIFICATION & LABELLING
Evacuate danger area! Remove all ignition sources. Consult an expert! Personal protection: face shield. Do NOT let this chemical enter the environment. Let solidify. Sweep spilled substance into covered containers. Carefully collect remainder. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

correxcl mark;warn
DANGER
May be corrosive to metals
Harmful if swallowed
Causes serious eye damage
May cause respiratory irritation
Harmful to aquatic life 

Transportation
UN Classification
UN Hazard Class: 8; UN Pack Group: III 

STORAGE
Store only in original container. Store only if stabilized. Separated from food and feedstuffs, strong bases and peroxides. Well closed. Dry. Keep in the dark. Ventilation along the floor. Store in an area without drain or sewer access. 
PACKAGING
Airtight.
Do not transport with food and feedstuffs. 
CROTONIC ACID ICSC: 0423
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE-TO-YELLOW CRYSTALS WITH PUNGENT ODOUR. 

Physical dangers
The vapour is heavier than air. 

Chemical dangers
The substance may polymerize under the influence of UV light or moisture. This generates fire and explosion hazard. The solution in water is a weak acid. Reacts violently with strong bases and peroxides. This generates fire and explosion hazard. 

Formula: C4H6O2 / CH3-CH=CH-COOH
Molecular mass: 86.09
Boiling point: 189°C
Melting point: 72°C
Relative density (water = 1): 1.02
Solubility in water at 20°C: soluble
Vapour pressure, Pa at 20°C: 24
Relative vapour density (air = 1): 2.97
Flash point: 88°C o.c.
Auto-ignition temperature: 396°C
Octanol/water partition coefficient as log Pow: 0.72  


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
The substance is corrosive to the eyes. The substance may be irritating to the respiratory tract. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered. 

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
The CAS number of unspecified crotonic acid is 3724-65-0 and cis-crotonic acid has CAS 503-64-0.
The trans isomer is also called just crotonic acid, while the cis isomer is called isocrotonic acid. Commercially (unspecified) crotonic acid consists mainly (or even completely) of the trans isomer. Synonyms of unspecified crotonic acid are: alpha-crotonic acid, beta-methylacrylic acid and 3-methylacrylic acid.
In general the substance will be transported as molten liquid. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations