ICSC 0177 - METHOMYL

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METHOMYL	ICSC: 0177 (October 2005)
S-Methyl-N-(methylcarbamoyloxy)thioacetimidate Ethanimidothioic acid, N-{{(methylamino)carbonyl}oxy}-, methyl ester Methyl N-{(methylamino)carbonyloxy}ethanimidothioate

CAS #: 16752-77-5

UN #: 2757

EC Number: 240-815-0

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Combustible under specific conditions. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.	NO open flames.	Use water spray, foam, powder, carbon dioxide.

PREVENT DISPERSION OF DUST! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Pupillary constriction, muscle cramp, excessive salivation. Muscle twitching. Dizziness. Headache. Sweating. Laboured breathing. Unconsciousness.	Use local exhaust or breathing protection.	Fresh air, rest. Half-upright position. Refer for medical attention. See Notes.
Skin		Protective gloves.	Remove contaminated clothes. Rinse skin with plenty of water or shower.
Eyes	Redness. Blurred vision.	Wear 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 refer for medical attention.
Ingestion	Abdominal cramps. Convulsions. Diarrhoea. Nausea. Vomiting. Weakness. Further see Inhalation.	Do not eat, drink, or smoke during work. Wash hands before eating.	Give a slurry of activated charcoal in water to drink. Refer immediately for medical attention.

SPILLAGE DISPOSAL	CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered sealable containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations.	According to UN GHS Criteria Transportation UN Classification UN Hazard Class: 6.1; UN Pack Group: II
STORAGE
Store in an area without drain or sewer access. Dry. Keep in a well-ventilated room. Separated from strong bases and food and feedstuffs.
PACKAGING
Unbreakable packaging. Put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs. Marine pollutant.

METHOMYL

ICSC: 0177

PHYSICAL & CHEMICAL INFORMATION
Physical State; Appearance WHITE CRYSTALS WITH CHARACTERISTIC ODOUR. Physical dangers Chemical dangers Decomposes on heating and on burning. This produces toxic and corrosive fumes including nitrogen oxides, sulfur oxides, hydrogen cyanide and methylisocyanate. Reacts with strong bases.	Formula: C₅H₁₀N₂O₂S Molecular mass: 162.2 Melting point: 78°C Density: 1.3 g/cm³ Solubility in water, g/100ml at 25°C: 5.8 (moderate) Vapour pressure at 25°C: negligible Octanol/water partition coefficient as log Pow: 1.24

PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE CRYSTALS WITH CHARACTERISTIC ODOUR.

Physical dangers

Chemical dangers
Decomposes on heating and on burning. This produces toxic and corrosive fumes including nitrogen oxides, sulfur oxides, hydrogen cyanide and methylisocyanate. Reacts with strong bases.

Formula: C₅H₁₀N₂O₂S
Molecular mass: 162.2
Melting point: 78°C
Density: 1.3 g/cm³
Solubility in water, g/100ml at 25°C: 5.8 (moderate)
Vapour pressure at 25°C: negligible
Octanol/water partition coefficient as log Pow: 1.24

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation of its aerosol and by ingestion. Effects of short-term exposure The substance is irritating to the eyes. The substance may cause effects on the nervous system. This may result in convulsions and respiratory depression. Cholinesterase inhibition. Exposure far above the OEL could cause death.	Inhalation risk A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster. Effects of long-term or repeated exposure The substance may have effects on the blood. This may result in anaemia.

EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

Effects of short-term exposure
The substance is irritating to the eyes. The substance may cause effects on the nervous system. This may result in convulsions and respiratory depression. Cholinesterase inhibition. Exposure far above the OEL could cause death.

Inhalation risk
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster.

Effects of long-term or repeated exposure
The substance may have effects on the blood. This may result in anaemia.

OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.2 mg/m³, as TWA; (skin); A4 (not classifiable as a human carcinogen); BEI issued

ENVIRONMENT
The substance is very toxic to aquatic organisms. This substance may be hazardous to the environment. Special attention should be given to birds and bees. This substance does enter the environment under normal use. Great care, however, should be taken to avoid any additional release, for example through inappropriate disposal.

NOTES
Methomyl is a mixture of (Z)- and (E)-isomers. If the pesticide is present in a formulation containing hydrocarbon solvents, vomiting should not be induced. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. If the substance is formulated with solvent(s) also consult the card(s) (ICSC) of the solvent(s). Carrier solvents used in commercial formulations may change physical and toxicological properties. Do NOT take working clothes home. Depending on the degree of exposure, periodic medical examination is suggested.

NOTES

Methomyl is a mixture of (Z)- and (E)-isomers.
If the pesticide is present in a formulation containing hydrocarbon solvents, vomiting should not be induced.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
If the substance is formulated with solvent(s) also consult the card(s) (ICSC) of the solvent(s).
Carrier solvents used in commercial formulations may change physical and toxicological properties.
Do NOT take working clothes home.
Depending on the degree of exposure, periodic medical examination is suggested.

ADDITIONAL INFORMATION

EC Classification
Symbol: T+, N; R: 28-50/53; S: (1/2)-22-36/37-45-60-61

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