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METHACRYLIC ACIDICSC: 0917
2-Methylpropenoic acid
alpha-Methylacrylic acid
March 1996
CAS #: 79-41-4
UN #: 2531 (stabilized)
EC Number: 201-204-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible. Gives off irritating or toxic fumes (or gases) in a fire.  Above 77°C explosive vapour/air mixtures may be formed.  NO open flames.  Above 77°C use a closed system and ventilation.  Use AFFF, alcohol-resistant foam, powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 AVOID ALL CONTACT!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Burning sensation. Shortness of breath. Laboured breathing.  Use ventilation (not if powder), local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Refer for medical attention. 
Skin Redness. Skin burns. Pain. Blisters.  Protective clothing.  First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. 
Eyes Redness. Pain. Loss of vision. 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 cramps. Abdominal pain. Burning sensation. Weakness.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Rest. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Collect leaking and spilled liquid in sealable plastic containers as far as possible. Cautiously neutralize remainder with aqueous sodium carbonate or lime. Then wash away with plenty of water. Do NOT absorb in saw-dust or other combustible absorbents. Personal protection: complete protective clothing including self-contained breathing apparatus. 

According to UN GHS Criteria

 

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

STORAGE
Separated from strong oxidants and food and feedstuffs. Cool. Keep in the dark. Keep in a well-ventilated room. Store only if stabilized. 
PACKAGING
Do not transport with food and feedstuffs. 
METHACRYLIC ACID ICSC: 0917
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID OR COLOURLESS CRYSTALS WITH CHARACTERISTIC ODOUR. 

Physical dangers
Vapours are uninhibited and may polymerize, causing blockage of vents. 

Chemical dangers
The substance readily polymerizes due to heating or under the influence of light, oxidizing agents such as peroxides, or in the presence of traces of hydrochloric acid. This generates fire or explosion hazard. Attacks metals. 

Formula: C4H6O2 / CH2=C(CH3)COOH
Molecular mass: 86.09
Boiling point: 159-163°C
Melting point: 16°C
Relative density (water = 1): 1.02
Solubility in water: moderate
Vapour pressure, Pa at 25°C: 130
Relative vapour density (air = 1): 2.97
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00
Flash point: 68°C c.c., 77°C o.c.
Explosive limits, vol% in air: 1.6-8.8
Octanol/water partition coefficient as log Pow: 0.93  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Effects of short-term exposure
The substance is corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Inhalation of the vapour may cause lung oedema. See Notes. 

Inhalation risk
A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C. 

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 20 ppm as TWA.
MAK: 180 mg/m3, 50 ppm; peak limitation category: I(2); pregnancy risk group: C 

ENVIRONMENT
 

NOTES
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 by an authorized person, should be considered.
An added stabilizer or inhibitor can influence the toxicological properties of this substance; consult an expert. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: C; R: 21/22-35; S: (1/2)-26-36/37/39-45; Note: D 

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    See Also:
       Toxicological Abbreviations
       Methacrylic acid (SIDS)