International Chemical Safety Cards

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

TYPES OF HAZARD/ EXPOSURE	ACUTE HAZARDS/ SYMPTOMS	PREVENTION	FIRST AID/ FIRE FIGHTING
FIRE	Not combustible.		In case of fire in the surroundings: powder, alcohol-resistant foam, water spray, carbon dioxide .
EXPLOSION			In case of fire: keep drums, etc., cool by spraying with water.

EXPOSURE		STRICT HYGIENE!
•INHALATION	Ataxia. Cough. Diarrhoea. Dizziness. Drowsiness. Nausea. Sore throat. Vomiting. Weakness.	Ventilation, local exhaust, or breathing protection.	Fresh air, rest. Half-upright position. Refer for medical attention.
•SKIN	MAY BE ABSORBED! Redness. Pain. (See Inhalation).	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
•EYES	Redness. Pain.	Safety spectacles, 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	(See Inhalation).	Do not eat, drink, or smoke during work.	Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). 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 food and feedstuffs. See Chemical Dangers. 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

SEE IMPORTANT INFORMATION ON BACK

ICSC: 0509

Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 2000. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards

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 or on burning producing hydrogen iodide. Reacts violently with strong oxidants. Reacts violently with oxygen (300-500°C), sodium, silver chlorite and trialkylphosphines, causing explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 2 ppm; 12 mg/m³ as TWA (skin) (ACGIH 1998).
OSHA PEL: TWA 5 ppm (28 mg/m³) skin
NIOSH REL: Ca TWA 2 ppm (10 mg/m³) skin See Appendix A
NIOSH IDLH: Potential occupational carcinogen 100 ppm

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion.

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 irritates the eyes, the skin and the respiratory tract. Inhalation of may cause lung oedema (see Notes). The substance may cause effects on the central nervous system and kidneys. Exposure at high levels may result in unconsciousness. 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 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 spray, by a doctor or a person authorized by him/her, should be considered.

Transport Emergency Card: TEC (R)-61G61a

ADDITIONAL INFORMATION

ICSC: 0509	METHYL IODIDE
(C) IPCS, CEC, 2000

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.