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METHYLAMINE (40% aqueous solution)ICSC: 1483
Methanamine
Aminomethane
Monomethylamine
May 2003
CAS #: 74-89-5
UN #: 1235
EC Number: 200-820-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Vapour/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.  Use water spray, alcohol-resistant foam, dry powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 AVOID ALL CONTACT!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Burning sensation. Cough. Headache. Sore throat. Laboured breathing. Shortness of breath.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Redness. Pain. Serious skin burns.  Protective gloves. Protective clothing.  Rinse skin with plenty of water or shower. Refer for medical attention . Remove contaminated clothes. 
Eyes Redness. Pain. Blurred vision. Severe deep burns.  Wear face shield 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. Shock or collapse.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Evacuate danger area! Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Ventilation. Remove all ignition sources. Collect leaking and spilled liquid in covered containers as far as possible. Cautiously neutralize remainder with dilute acid. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Carefully collect remainder. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 3; UN Subsidiary Risks: 8; UN Pack Group: II 

STORAGE
Fireproof. Cool. Well closed. Separated from food and feedstuffs, strong acids, oxidants, aluminium, copper, zinc, zinc alloys and mercury. Keep in a well-ventilated room. 
PACKAGING
Do not transport with food and feedstuffs. 
METHYLAMINE (40% aqueous solution) ICSC: 1483
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS SOLUTION IN WATER WITH PUNGENT ODOUR. 

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

Chemical dangers
Reacts violently with mercury compounds. This generates fire and explosion hazard. The substance is a medium strong base. Attacks plastics, rubber, copper, aluminium, zinc alloys and galvanized surfaces. 

Formula: CH5N / CH3NH2
Molecular mass: 31.1
Boiling point: 48°C
Melting point: -39°C
Relative density (water = 1): 0.89
Vapour pressure, kPa at 20°C: 31
Relative vapour density (air = 1): 1.08
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.02
Flash point: -10°C
Auto-ignition temperature: 430°C
Explosive limits, vol% in air: 4.9-20.8
Octanol/water partition coefficient as log Pow: -0.6  


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
The substance is corrosive to the eyes and skin. The vapour is severely irritating to the respiratory tract. Corrosive on ingestion. 

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

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
See ICSC 0178 Methylamine gas in a cylinder. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: F+, C; R: 12-20/22-34; S: (2)-3-16-26-29-36/37/39-45; Note: B 

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       Toxicological Abbreviations