Acute toxicity - Category 2, Oral
Hazardous to the aquatic environment, short-term (Acute) - Category Acute 1
Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 1
H300 Fatal if swallowed
H410 Very toxic to aquatic life with long lasting effects
P264 Wash ... thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P273 Avoid release to the environment.
P301+P316 IF SWALLOWED: Get emergency medical help immediately.
P321 Specific treatment (see ... on this label).
P330 Rinse mouth.
P391 Collect spillage.
P405 Store locked up.
P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal.
no data available
Fresh air, rest. Half-upright position. Refer for medical attention. See Notes.
Remove contaminated clothes. Rinse skin with plenty of water or shower.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.
Give a slurry of activated charcoal in water to drink. Refer immediately for medical attention.
Methomyl has high oral toxicity, moderate inhalation toxicity and low skin toxicity. The probable oral lethal dose for humans is between 7 drops and 1 teaspoon for a 150 pound adult. Death is due to respiratory arrest. (EPA, 1998)
Basic treatment: Establish a patent airway. Suction if necessary. Aggressive airway control may be needed. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary . Monitor for shock and treat if necessary . Anticipate seizures and treat if necessary . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool. Administer activated charcoal . Carbamates and related compounds
Non-Specific -- Carbamate Pesticide, Solid) Wear self-contained breathing apparatus. (Non-Specific -- Carbamate Pesticide, Solid) Use agent suitable for type of surrounding fire. Use water in flooding quantities as a fog. Use alcohol foam, carbon dioxide, or dry chemical. (EPA, 1998)
When heated to decomposition, it emits very toxic fumes of nitrogen oxides and sulfur oxides. Do not subject liquid formulations to temperatures below 32F. (EPA, 1998)
Use water spray, foam, powder, carbon dioxide.
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.
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.
A system for removing pesticides from the wash water produced by pesticide applicators as they clean their equipment has been developed. The first step is the flocculation/coagulation and sedimentation of the pesticide-contaminated wash water. The supernatant from the first step is then passed through activated carbon columns. Pesticides
NO open flames. Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.
Store in an area without drain or sewer access. Dry. Keep in a well-ventilated room. Separated from strong bases and food and feedstuffs.Keep /liq formulations/ away from heat, sparks, & open flame. Do not subject liquid to temperatures below 32 deg F.
TLV: 0.2 mg/m3, as TWA; (skin); A4 (not classifiable as a human carcinogen); BEI issued
no data available
Ensure adequate ventilation. Handle in accordance with good industrial hygiene and safety practice. Set up emergency exits and the risk-elimination area.
Wear safety goggles or eye protection in combination with breathing protection.
Protective gloves.
Use local exhaust or breathing protection.
no data available
Methomyl is a white crystalline solid with slight sulfurous smell. Used as a nematocide, and an insecticide on vegetables, tobacco, cotton, alfalfa, soy beans, and corn. (EPA, 1998)
White crystalline solid
Slightly sulfurous
78°C
144°C
Noncombustible Solid, but may be dissolved in flammable liquids.
no data available
no data available
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6 % at 77° F (NIOSH, 2016)
log Kow= 0.60
5e-05 mm Hg at 77° F (EPA, 1998)
1.17 g/cm3
no data available
no data available
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.
Stable in neutral or slightly acidic soln.
Liquid formulations flammable.METHOMYL is a carbamate ester. Carbamates are chemically similar to, but more reactive than amides. Like amides they form polymers such as polyurethane resins. Carbamates are incompatible with strong acids and bases, and especially incompatible with strong reducing agents such as hydrides. Flammable gaseous hydrogen is produced by the combination of active metals or nitrides with carbamates. Strongly oxidizing acids, peroxides, and hydroperoxides are incompatible with carbamates.
no data available
Strong bases.
When heated to decomposition it emits very toxic fumes of /nitrogen oxides & sulfur oxides/.
no data available
no data available
no data available
no data available
Cancer Classification: Group E Evidence of Non-carcinogenicity for Humans
no data available
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.
The substance may have effects on the blood. This may result in anaemia.
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.
Methomyl seemed to be stable for about 16 days after application to an alluvial soil, but then degraded faster in the non-autoclaved alluvial soil as compared to autoclaved soil suggesting the importance of microbial degradation(1). Soil microorganisms were found to be the primary factor responsible for methomyl conversion in various soil types(2). Laboratory studies indicated that methyl radiolabeled methomyl was rapidly degraded in soil via microbial action with carbon dioxide as the principal end product(3). Microbial transformation of methomyl in two tobacco-growing soils was found to occur after an initial lag phase of 7-14 days, but occurred with virtually no lag phase in soils previously treated with methomyl(4). After the initial lag phase, half-lives of about 5-6 weeks were determined for methomyl in these soils(4). Comparison with tests using soils sterilized with sodium azide suggested that microbial transformation is likely to be the major factor in methomyl degradation in soil(4). The half-life of methomyl in three greenhouse soils was about 3-14 days(5). The half-life of methomyl was reported as 30 days in soil(6).
An estimated BCF of 3 was calculated for methomyl(SRC), using a log Kow of 0.6(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC).
The measured Koc of methomyl was reported as 160(1). According to a classification scheme(2), this Koc value suggests that methomyl is expected to have moderate mobility in soil. Under field conditions and using laboratory studies, only slight movement of methomyl has been observed in soil(3,4).
no data available
The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.
Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.
ADR/RID: UN2991 (For reference only, please check.)
IMDG: UN2991 (For reference only, please check.)
IATA: UN2991 (For reference only, please check.)
ADR/RID: CARBAMATE PESTICIDE, LIQUID, TOXIC, FLAMMABLE, flash point not less than 23 °C (For reference only, please check.)
IMDG: CARBAMATE PESTICIDE, LIQUID, TOXIC, FLAMMABLE, flash point not less than 23 °C (For reference only, please check.)
IATA: CARBAMATE PESTICIDE, LIQUID, TOXIC, FLAMMABLE, flash point not less than 23 °C (For reference only, please check.)
ADR/RID: 6.1 (For reference only, please check.)
IMDG: 6.1 (For reference only, please check.)
IATA: 6.1 (For reference only, please check.)
ADR/RID: I (For reference only, please check.)
IMDG: I (For reference only, please check.)
IATA: I (For reference only, please check.)
ADR/RID: Yes
IMDG: Yes
IATA: Yes
no data available
no data available
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.