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METHYLAMINEICSC: 0178
September 2002
CAS #: 74-89-5Methanamine
Aminomethane
Monomethylamine
UN #: 1061 (anhydrous)
EINECS #: 200-820-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Extremely flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Gas/air mixtures are explosive.  NO open flames, NO sparks and NO smoking.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Use non-sparking handtools.  Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out. In other cases extinguish with powder, carbon dioxide.  In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position. 

 STRICT HYGIENE!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Burning sensation. Cough. Headache. Laboured breathing. Shortness of breath. Sore throat. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin ON CONTACT WITH LIQUID: FROSTBITE.  Cold-insulating gloves. Protective clothing.  ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention . 
Eyes Redness. 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   Do not eat, drink, or smoke during work.   

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. Remove all ignition sources. NEVER direct water jet on liquid. Remove vapour with fine water spray. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 2.1 

STORAGE
Fireproof. Cool. 
PACKAGING
 
METHYLAMINE ICSC: 0178
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR. 

Physical dangers
The gas mixes well with air, explosive mixtures are easily formed. 

Chemical dangers
Decomposes on burning. This produces toxic fumes including nitrogen oxides. The solution in water is a strong base. It reacts violently with acid and is corrosive. Reacts violently with strong oxidants. Attacks plastics, rubber and coatings. Attacks copper, zinc alloys, aluminium and galvanized surfaces. 

Formula: CH5N / CH3NH2
Molecular mass: 31.1
Boiling point: -6°C
Melting point: -93°C
Relative density (water = 1): 0.7 (liquid)
Solubility in water at 25°C: very good
Vapour pressure, kPa at 20°C: 304
Relative vapour density (air = 1): 1.07
Flash point: Flammable gas
Auto-ignition temperature: 430°C
Explosive limits, vol% in air: 4.9-20.7
Octanol/water partition coefficient as log Pow: -0.71  


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 and respiratory tract. Inhalation of high levels may cause lung oedema. See Notes. The effects may be delayed. Medical observation is indicated. Rapid evaporation of the liquid may cause frostbite. 

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment. 

Effects of long-term or repeated exposure
 


Occupational exposure limits
TLV: 5 ppm as TWA; 15 ppm as STEL.
MAK: 13 mg/m3, 10 ppm; peak limitation category: I(1); pregnancy risk group: D 

ENVIRONMENT
 

NOTES
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.
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 is 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
Symbol: F+, Xn; R: 12-20-37/38-41; S: (2)-16-26-39 

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    See Also:
       Toxicological Abbreviations