S-Methyl-N-(methylcarbamoyloxy)thioacetimidate
Ethanimidothioic acid, N-{{(methylamino)carbonyl}oxy}-, methyl ester
Methyl N-{(methylamino)carbonyloxy}ethanimidothioate
C5H10N2O2S
Molecular mass: 162.2
ICSC # 0177
CAS # 16752-77-5
RTECS # AK2975000
UN # 2757
EC # 006-045-00-2
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Combustible under specific conditions.
Liquid formulations containing organic solvents may be flammable.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO open flames.
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Water spray, foam, powder, carbon dioxide.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
STRICT HYGIENE!
AVOID Exposure OF ADOLESCENTS AND CHILDREN!
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•Inhalation
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Pupillary constriction, muscle cramp, excessive salivation.
Muscle twitching.
Dizziness.
Headache.
Sweating.
Laboured breathing.
Unconsciousness.
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Local exhaust or breathing protection.
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Fresh air, rest.
Half-upright position.
Refer for medical attention.
See Notes.
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•Skin
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Protective gloves.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
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•Eyes
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Redness.
Blurred vision.
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Safety goggles
or
eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal cramps.
Convulsions.
Diarrhoea.
Nausea.
Vomiting.
Weakness.
(Further see Inhalation).
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Do not eat, drink, or smoke during work.
Wash hands before eating.
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Give a slurry of activated charcoal in water to drink.
Refer for medical attention
immediately.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Personal protection: P3 filter respirator for toxic particles.
Do NOT let this chemical enter the environment.
Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting.
Carefully collect remainder,
then remove to safe place.
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Store in an area without drain or sewer access.
Dry.
Keep in a well-ventilated room.
Separated from
strong bases,
food and feedstuffs
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Unbreakable packaging; put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs.
Marine pollutant.
T+ symbol
N symbol
R: 28-50/53
S: 1/2-22-36/37-45-60-61
UN Hazard Class: 6.1
UN Packing Group: II
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Important Data
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Physical State; Appearance:
WHITE
CRYSTALS
, WITH CHARACTERISTIC ODOUR.
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating
and
on burning
producing toxic and corrosive fumes including nitrogen oxides, sulfur oxides, hydrogen cyanide, methylisocyanate.
Reacts
with
strong bases
.
Occupational Exposure Limits:
TLV: 2.5 mg/m3 as TWA; A4 (not classifiable as a human carcinogen); BEI issued; (ACGIH 2005).
MAK not established.
OSHA PEL: none
NIOSH REL: TWA 2.5 mg/m3
NIOSH IDLH: N.D. See: IDLH INDEX
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation of its aerosol
and
by ingestion.
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 Short-Term Exposure:
The substance
is irritating to
the eyes
.
The substance may cause effects on the
nervous system
, resulting in
convulsions
and
respiratory depression
.
Cholinesterase inhibitor.
Exposure far above the OEL may result in death.
Effects of Long-Term or Repeated Exposure:
The substance may have effects on the
blood
, resulting in
anaemia
.
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Physical
Properties
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Melting point: 78°C
Density: 1.3
g/cm3
Solubility in water, g/100 ml at 25°C: 5.8
(moderate)
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Vapour pressure, Pa at 25°C:
negligible
Octanol/water partition coefficient as log Pow: 1.24
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Environmental
Data
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The substance is very toxic to aquatic organisms.
This substance may be hazardous in the environment; special attention should be given to birds and honey bees.
This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal.
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N O T E S
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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 solvents also consult the ICSCs of these materials.
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.
Du Pont 1179, Flytek, Lannate, Lanox, Methavin, Methomex, Nudrin are trade names.
Transport Emergency Card: TEC (R)-61GT7-II
Card has been partially updated in January 2008: see Ingestion First Aid.
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ADDITIONAL INFORMATION
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ICSC: 0177
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METHOMYL
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(C) IPCS, CEC, 1994
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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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