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METHYL BROMIDE ICSC: 0109
Date of Peer Review: April 1994

Bromomethane
Monobromomethane
(cylinder)
CAS # 74-83-9 CH3Br
RTECS # PA4900000 Molecular mass: 94.9
UN # 1062
EC Index # 602-002-00-2
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Combustible under specific conditions. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames. NO contact with aluminium, zinc, magnesium or pure oxygen.
Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with - use appropriate extinguishing agent.
EXPLOSION Risk of fire and explosion on contact with aluminium, zinc or magnesium.

In case of fire: keep cylinder cool by spraying with water.
EXPOSURE
STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Dizziness. Headache. Abdominal pain. Vomiting. Weakness. Hallucinations. Loss of speech. Incoordination. Laboured breathing. Convulsions.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.
Skin MAY BE ABSORBED! Tingling. Itching. Burning sensation. Redness. Blisters. Pain. ON CONTACT WITH LIQUID: FROSTBITE. (Further see Inhalation).
Cold-insulating gloves. Protective clothing.
ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Redness. Pain. Blurred vision. Temporary loss of vision.
Safety goggles, 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 take to a doctor.
Ingestion


SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. NEVER direct water jet on liquid. Personal protection: complete protective clothing including self-contained breathing apparatus.
EU Classification
Symbol: T, N
R: 23/25-36/37/38-48/20-68-50-59
S: (1/2-)-15-27-36/39-38-45-59-61
UN Classification
UN Hazard Class: 2.3

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20S1062
NFPA Code: H 3; F 1; R 0;
Fireproof if in building. Separated from strong oxidants, aluminium and cylinders containing oxygen. Cool. Ventilation along the floor.
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 2005

SEE IMPORTANT INFORMATION ON BACK
METHYL BROMIDE ICSC: 0109
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
ODOURLESS AND COLOURLESS COMPRESSED LIQUEFIED GAS.

PHYSICAL DANGERS:
The gas is heavier than air.

CHEMICAL DANGERS:
The substance decomposes on heating and on burning producing toxic and corrosive fumes including hydrogen bromide, bromine and carbon oxybromide. Reacts with strong oxidants. Attacks many metals in presence of water. Attacks aluminium, zinc and magnesium with formation of pyrophoric compounds, causing fire and explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 1 ppm as TWA; (skin); A4 (not classifiable as a human carcinogen); (ACGIH 2004).
MAK: skin absorption (H); Carcinogen category: 3B; (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation and through the skin, also as a vapour!

INHALATION RISK:
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes, the skin and the respiratory tract. Inhalation of the substance may cause lung oedema (see Notes). Rapid evaporation of the liquid may cause frostbite. The substance may cause effects on the central nervous system, kidneys and lungs. Exposure to high concentrations may result in death. The effects may be delayed.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the nervous system, kidneys, heart, liver and lungs.
PHYSICAL PROPERTIES
Boiling point: 4C
Melting point: -94C
Relative density (water = 1): 1.7
Solubility in water, ml/100 ml at 20C: 1.5
Relative vapour density (air = 1): 3.3
Auto-ignition temperature: 537C
Explosive limits, vol% in air: 10-16
Octanol/water partition coefficient as log Pow: 1.19
ENVIRONMENTAL DATA
This substance may be hazardous in the environment; special attention should be given to fish, mammals, plants, soil organisms.
NOTES
Depending on the degree of exposure, periodic medical examination is suggested. 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. The odour warning when the exposure limit value is exceeded is insufficient. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Bromo-O-gas, Dowfume, Embafume, Halon 1001, Haltox, Meth-o-gas, Terabol and Terr-o-Gas 100 are trade names. Card has been partly updated in October 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response.
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 2005