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METHYLAMINE ICSC: 0178
Date of Peer Review: October 2002

Methanamine
Aminomethane
Monomethylamine
(cylinder)
CAS # 74-89-5 CH5N / CH3NH2
RTECS # PF6300000 Molecular mass: 31.1
UN # 1061 (anhydrous)
EC # 612-001-00-9
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Extremely flammable. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames, NO sparks, and NO smoking.
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.
EXPLOSION Gas/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Use non-sparking handtools.
In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.
EXPOSURE
STRICT HYGIENE!

Inhalation Burning sensation. Cough. Headache. Laboured breathing. Shortness of breath. Sore throat. See Notes.
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.
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 take to a doctor.
Ingestion
Do not eat, drink, or smoke during work.

SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. NEVER direct water jet on liquid. Remove vapour with fine water spray. (Extra personal protection: complete protective clothing including self-contained breathing apparatus.)
EU Classification
Symbol: F+, Xn
R: 12-20-37/38-41
S: (2-)-16-26-39
UN Classification
UN Hazard Class: 2.1

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC 20S1061
NFPA Code: H3; F4; R0.
Fireproof. Cool.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 1999

SEE IMPORTANT INFORMATION ON BACK


METHYLAMINE ICSC: 0178
IMPORTANT DATA
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:
The substance decomposes on burning producing 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 plastic, rubber and coatings. Attacks copper, zinc alloys, aluminium and galvanized surfaces.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: (as TWA) 5 ppm; (as STEL) 15 ppm; (ACGIH 2002).
MAK: 10 ppm, 13 mg/m; (DFG 2002).
MAK: class Peak limitation category: I (1) ceiling; Pregnancy risk group IIc; (2002)
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
On loss of containment, a harmful concentration of this gas in the air will be reached very quickly.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is corrosive to the eyes and the respiratory tract. Inhalation of the substance at 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.

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

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


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 1999
See Also:
        Methylamine (40% aqueous soution) (ICSC)
        Methylamine, anhydrous (CHEMINFO)
        Methylamine, solutions (CHEMINFO)