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NIOSH

METHYL IODIDE

ICSC: 0509

Iodomethane
CH3I
Molecular mass: 142.0
ICSC # 0509 		CAS # 74-88-4
RTECS # PA9450000
UN # 2644
EC # 602-005-00-9
April 22, 2004 Validated

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

STORAGE

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.
Separated from strong oxidants, food and feedstuffs . Well closed. Ventilation along the floor.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
T symbol
R: 21-23/25-37/38-40
S: 1/2-36/37-38-45
UN Hazard Class: 6.1
UN Packing Group: I
ICSC: 0509 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

METHYL IODIDE

ICSC: 0509

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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 300°C causing explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 2 ppm as TWA; (skin); (ACGIH 2004).
MAK:
Carcinogen category: 2
skin absorption (H); (DFG 2006).
OSHA PEL: TWA 5 ppm (28 mg/m3) skin
NIOSH REL: Ca TWA 2 ppm (10 mg/m3) skin See Appendix A
NIOSH IDLH: Ca 100 ppm See: 74884


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.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

PHYSICAL
PROPERTIES

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

ENVIRONMENTAL
DATA


N O T E S

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. Card has been partly updated in October 2006. See section Occupational Exposure Limits.
Transport Emergency Card: TEC (R)-61GT1-I

ADDITIONAL INFORMATION



ICSC: 0509 METHYL IODIDE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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