International Chemical Safety Cards

METHOMYL ICSC: 0177

METHOMYL
S-Methyl-N-(methylcarbamoyloxy)thioacetimidate
Ethanimidothioic acid, N-{{(methylamino)carbonyl}oxy}-, methyl ester
Methyl N-{(methylamino)carbonyloxy}ethanimidothioate
C5H10N2O2S
Molecular mass: 162.2
CAS # 16752-77-5 1
RTECS # AK2975000
ICSC # 0177
UN # 2757
EC # 006-045-00-2
TYPES OF
HAZARD/
EXPOSURE 		ACUTE HAZARDS/
SYMPTOMS 		PREVENTION FIRST AID/
FIRE FIGHTING
FIRE 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.
Powder, water spray, foam, carbon dioxide.
EXPLOSION Risk of fire and explosion if formulations contain flammable/explosive solvents.


EXPOSURE
PREVENT DISPERSION OF DUST! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!
IN ALL CASES CONSULT A DOCTOR!
  • INHALATION
    		• Dizziness. Headache. Sweating. Laboured breathing. Unconsciousness. Pupillary constriction, muscle cramp, excessive salivation.
    		Local exhaust or breathing protection.
    		Fresh air, rest. Half-upright position. Refer for medical attention. See Notes.
  • SKIN
    		• MAY BE ABSORBED! (Further see Inhalation).
    		Protective gloves. Protective clothing.
    		Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention (See Notes).
  • EYES
    		• Redness. Blurred vision.
    		Safety spectacles 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
    		• Abdominal cramps. Convulsions. Diarrhoea. Nausea. Vomiting. Weakness. Muscle twitching (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. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Rest. Refer for medical attention. See Notes.
    SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
    Do NOT wash away into sewer. Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place (extra personal protection: complete protective clothing including self-contained breathing apparatus).
    		Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Dry. Keep in a well-ventilated room.
    		Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
    T+ symbol
    R: 28
    S: (1/2-)22-36/37-45
    UN Hazard Class: 6.1
    UN Packing Group: II
    Marine pollutant.
    SEE IMPORTANT INFORMATION ON BACK
    ICSC: 0177 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993 No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and IDLH values.

    International Chemical Safety Cards

    METHOMYL ICSC: 0177

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    PHYSICAL STATE; APPEARANCE:
     WHITE CRYSTALS.




    CHEMICAL DANGERS:
     The substance decomposes on heating and on burning producing toxic and irritating fumes including nitrogen oxides, sulfur oxides, hydrogen cyanide, methylisocyanate.

    OCCUPATIONAL EXPOSURE LIMITS (OELs):
     TLV: ppm; 2.5 mg/m3 (ACGIH 1993).
    OSHA PEL: none
    NIOSH REL: TWA 2.5 mg/m3
    NIOSH IDLH: No data


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

    INHALATION RISK:
     Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying or when dispersed, especially if powdered.

    EFFECTS OF SHORT-TERM EXPOSURE:
     The substance irritates the eyes. The substance may cause effects on the nervous system , resulting in respiratory failure, convulsions. Cholinesterase inhibitor. Exposure may result in death.

    EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
     The substance may have effects on the blood , resulting in anaemia.
    PHYSICAL
    PROPERTIES
    Melting point: 78°C
    Relative density (water = 1): 1.3
    Solubility in water, g/100 ml at 25°C: 5.8 (moderate)
    		Vapour pressure, Pa at 25°C: 0.007
    Octanol/water partition coefficient as log Pow: 0.6
    ENVIRONMENTAL
    DATA
         		This substance may be hazardous to the environment; special attention should be given to birds, honey bees and water organisms.
    N O T E S
    Methomyl is a mixture of (Z)- and (E)-isomers. If the pesticide is present under the form of a formulation containing hydrocarbon solvents, vomiting may 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. Du Pont 1179, Flytek, Lannate, Lanox, Methavin, Methomex, Nudrin are trade names.
    Transport Emergency Card: TEC (R)-61G47b-1
    ADDITIONAL INFORMATION


    ICSC: 0177 METHOMYL
    © IPCS, CEC, 1993
    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 IDLH values.