INTOX Home Page
METHYL IODIDE ICSC: 0509
Date of Peer Review: April 2004

Iodomethane
CAS # 74-88-4 CH3I
RTECS # PA9450000 Molecular mass: 142.0
UN # 2644
EC # 602-005-00-9
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible.

In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION

In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE
STRICT HYGIENE!

Inhalation Cough. Sore throat. Headache. Dizziness. Drowsiness. Weakness. Confusion. Diarrhoea. Nausea. Vomiting. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin Redness. Pain. Blisters.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Redness. Pain.
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 (See Inhalation).
Do not eat, drink, or smoke during work.
Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Give a slurry of activated charcoal in water to drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Chemical protection suit including self-contained breathing apparatus.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
EU Classification
Symbol: T
R: 21-23/25-37/38-40
S: (1/2-)-36/37-38-45
UN Classification
UN Hazard Class: 6.1
UN Pack Group: I
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GT1-I
Separated from strong oxidants, food and feedstuffs. Well closed. 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 1999

SEE IMPORTANT INFORMATION ON BACK
METHYL IODIDE ICSC: 0509
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR. TURNS BROWN ON EXPOSURE TO LIGHT AND MOISTURE.

PHYSICAL DANGERS:
The vapour is heavier than air and may accumulate in low ceiling spaces causing deficiency of oxygen.

CHEMICAL DANGERS:
The substance decomposes on heating above 270C producing hydrogen iodide. Reacts violently with strong oxidants. Reacts violently with oxygen at 300C causing explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 2 ppm as TWA; (skin); (ACGIH 2004).
MAK: Carcinogen category: 2 (DFG 2003).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour, by ingestion and through the skin.

INHALATION RISK:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes, the skin and the respiratory tract The substance may cause effects on the central nervous system. The effects may be delayed. Medical observation is indicated.

PHYSICAL PROPERTIES
Boiling point: 42.5C
Melting point: -66.5C
Relative density (water = 1): 2.3
Solubility in water, g/100 ml at 20C: 1.4
Vapour pressure, kPa at 20C: 50
Relative vapour density (air = 1): 4.9
Relative density of the vapour/air-mixture at 20C (air = 1): 2.9
Octanol/water partition coefficient as log Pow: 1.51-1.69
ENVIRONMENTAL DATA

NOTES
The symptoms of central nervous system do not become manifest until days or weeks after exposure. Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken.
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:
        Methyl iodide (CHEMINFO)
        Methyl iodide (IARC Summary & Evaluation, Volume 15, 1977)
        Methyl iodide (IARC Summary & Evaluation, Volume 41, 1986)
        Methyl iodide (IARC Summary & Evaluation, Volume 71, 1999)
        Methyl iodide (PIM 341F, French)