ICSC 0509 - METHYL IODIDE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

METHYL IODIDE

ICSC: 0509
_{April 2004}

Iodomethane

CAS No: 74-88-4
RTECS No: PA9450000
UN No: 2644
EC No: 602-005-00-9

CH₃I
Molecular mass: 142.0

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	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.	T Symbol R: 21-23/25-37/38-40 S: (1/2-)36/37-38-45 UN Hazard Class: 6.1 UN Pack Group: I	Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.

EMERGENCY RESPONSE	STORAGE
Transport Emergency Card: TEC (R)-61GT1-I	Separated from strong oxidants, food and feedstuffs. Well closed. Ventilation along the floor.

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 270°C producing hydrogen iodide. Reacts violently with strong oxidants. Reacts violently with oxygen at 300°C 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 20°C.

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

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.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004

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Updated by AS. Approved by EC. Last update: 05.07.2004