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CROTONIC ACIDICSC: 0423
March 1996
CAS #: 3724-65-0trans-2-Butenoic acid
beta-Methylacrylic acid
alpha-Crotonic acid
3-Methylacrylic acid
UN #: 2823
EINECS #: 223-077-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible.  Above 88°C explosive vapour/air mixtures may be formed. Finely dispersed particles form explosive mixtures in air.  NO open flames. NO contact with strong oxidizing agents. NO contact with hot surfaces.  Above 88°C use a closed system, ventilation and explosion-proof electrical equipment.  Use water spray, foam, powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 PREVENT DISPERSION OF DUST! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Burning sensation. Cough. Headache. Nausea. Shortness of breath. Sore throat. Symptoms may be delayed. See Notes.  Use local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Skin burns. Burning sensation. Pain.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Pain. Blurred vision. Severe deep burns.  Wear safety goggles or eye protection in combination with breathing protection.  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. Diarrhoea. Sore throat. Vomiting.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Rest. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Let solidify. Sweep spilled substance into covered containers. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

 

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

STORAGE
Separated from food and feedstuffs, bases, oxidants and reducing agents. Dry. Keep in the dark. 
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
 

Chemical dangers
The substance may polymerize under the influence of UV light or moisture. The solution in water is a weak acid. Reacts violently with bases, oxidants and reducing agents. 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, g/100ml at 25°C: 9.4
Vapour pressure, Pa at 20°C: 19
Relative vapour density (air = 1): 2.97
Flash point: 88°C o.c.
Auto-ignition temperature: 396°C  


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
Corrosive. The substance is corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Inhalation of the vapour may cause lung oedema. See Notes. The effects may be delayed. Medical observation is indicated. 

Inhalation risk
 

Effects of long-term or repeated exposure
 


Occupational exposure limits
 

ENVIRONMENT
 

NOTES
In general the substance will be transported as molten liquid.
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation are therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations