Substance profile
Methomyl
Methomyl is a white crystalline solid with a slightly sulfurous odor.
01 · Identification
What Methomyl is
Methomyl is a white crystalline solid with a slightly sulfurous odor. It boils at 335 °C, melts at 77.8 °C.
Under the GHS it carries the signal word Danger.
02 · Identifiers
Methomyl identifiers and molecular data
Methomyl CAS number and EC number
Other names for Methomyl
- methomyl (ISO)
- 1-(methylthio)ethylideneamino N-methylcarbamate
03 · GHS classification
Methomyl hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Methomyl pictograms and signal word
Methomyl hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 1 or 2 | H300 | GHS06 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Methomyl hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H300 | Fatal if swallowed. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Methomyl. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Methomyl
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Methomyl issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Methomyl precautionary statements
CLP Annex VI assigns 7 precautionary statements to Methomyl. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Methomyl name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | метомил (ISO) 1-(метилтио)етилиденамино- N -метилкарбамат |
| Spanish español | Metomilo (ISO) N -metilcarbamato de 1-(metiltio)-etilidenamino |
| Czech čeština | methomyl (ISO) methyl-[(N-methylkarbamoyloxy)thioacetimidát] |
| Danish dansk | methomyl (ISO) 1-(methylthio)ethylidenamino- N- methylcarbamat |
| German Deutsch | Methomyl (ISO) 1-(Methylthio)ethylidenamino- N -methylcarbamat |
| Estonian eesti | metomüül (ISO) 1-(metüültio)etülideenamino- N -metüülkarbamaat |
| Greek ελληνικά | methomyl (μεθομύλη) (ISO) N -μεθυλοκαρβαμιδική 1-(μεθυλοθειο)αιθυλιδεναμίνη |
| English English | methomyl (ISO) 1-(methylthio)ethylideneamino N -methylcarbamate |
| French français | méthomyl (ISO) 1-(méthylthio)éthylidèneamino N -méthylcarbamate |
| Croatian hrvatski | metomil (ISO) 1-(metiltio)etilidenamino- N -metil-karbamat |
| Italian italiano | metomil (ISO) N-metilcarbammato di 1-(metiltio)etilidenammina |
| Latvian latviešu | metomils (ISO) 1-(metiltio)etilidēnamino- N -metilkarbamāts |
| Lithuanian lietuvių | metomilas (ISO) 1-(metiltio)etilidenamino- N -metilkarbamatas |
| Hungarian magyar | metomil (ISO) 1-(metiltio)etilidén-amino- N -metil-karbamát |
| Maltese Malti | metomil (ISO) N -metilkarbamat ta’ 1-(metiltijo)etilideneamino |
| Dutch Nederlands | methomyl (ISO) 1-(methylthio)ethylideenamino- N -methylcarbamaat |
| Polish polski | metomyl (ISO) N -(metylokarbamoiloksy)acetoimidan metylu |
| Portuguese português | metomil (ISO) N -metilcarbamato 1-(metiltio)etilidenoamínico |
| Romanian română | metomil (ISO) N -metilcarbamat de 1-(metiltio)etilidenamino |
| Slovak slovenčina | metomyl (ISO) O -[1-(metylsulfanyl)etylidénamino]- N -metylkarbamát |
| Slovenian slovenščina | metomil (ISO) 1-(metiltio)etilidenamino N -metilkarbamat |
| Finnish suomi | metomyyli (ISO) 1-(metyylitio)etylideeniamino- N -metyylikarbamaatti |
| Swedish svenska | metomyl (ISO) 1-(metyltio)etylidenamino- N -metylkarbamat |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Methomyl GHS label elements
Everything CLP Annex VI fixes for Methomyl, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Methomyl
- Fatal if swallowed.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Do not eat, drink or smoke when using this product.
- Avoid release to the environment.
- IF SWALLOWED:
- Immediately call a POISON CENTER/doctor/…
- Rinse mouth.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Methomyl in the GHS label constructor →
07 · Health hazards
Methomyl health hazards and exposure limits
Methomyl carcinogenicity classification
Cancer Classification: Group E Evidence of Non-carcinogenicity for Humans
Source: Hazardous Substances Data Bank (HSDB)
An IARC group and a CLP classification answer different questions. IARC judges whether the evidence for cancer in humans is strong enough; CLP Annex VI is the legally binding EU classification. A substance can carry one and not the other.
Methomyl occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | none See Appendix G | The National Institute for Occupational Safety and Health (NIOSH) |
| REL | 2.5 mg/m³ | Occupational Safety and Health Administration (OSHA) |
| REL | TWA 2.5 mg/m3 | The National Institute for Occupational Safety and Health (NIOSH) |
| IDLH | N.D. | The National Institute for Occupational Safety and Health (NIOSH) |
These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.
08 · Physical and chemical properties
Methomyl properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
Methomyl boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 335 °C (635 °F) | at 760 mmHg | DOE PAC |
Methomyl melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 77.78 °C (172 °F) | NIOSH | |
| 78 °C (172.4 °F) | ICSC |
Methomyl density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.3 g/cm³ | ICSC | |
| 1.2946 g/cm³ | at 23.89 °C | CAMEO | |
| 1.2946 g/cm³ | at 24 °C | HSDB |
Methomyl solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | SOL IN MOST ORG SOLVENTS | HSDB | |
| Sol at 25 °C in wt/wt percent: water 5.8; ethanol 42; methanol 100; isopropanol 22; acetone 73 | at 25 °C | HSDB | |
| In water, 58,000 mg/l @ 25 °C | at 25 °C | HSDB |
Methomyl vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.0000054 mmHg | at 25 °C | HSDB |
| 0.00005 mmHg | at 25 °C | NIOSH |
Methomyl lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Noncombustible Solid, but may be dissolved in flammable liquids. | NIOSH |
Methomyl corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | AQ SOLN NONCORROSIVE | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Methomyl fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Methomyl fire potential
Liquid formulations flammable.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Methomyl storage and handling
Methomyl safe 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.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Methomyl storage conditions
Keep /liq formulations/ away from heat, sparks, & open flame. Do not subject liquid to temperatures below 32 °F.
Source: Hazardous Substances Data Bank (HSDB)
Methomyl incompatible materials
Strong bases.
Source: Hazardous Substances Data Bank (HSDB)
Methomyl reactivity
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.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Methomyl in the storage compatibility matrix →
11 · Questions
Methomyl — frequently asked questions
What is the CAS number of Methomyl?
The CAS number of Methomyl is 16752-77-5. Its EC number is 240-815-0.
What does a Methomyl label have to show?
Under CLP Annex VI the label for Methomyl carries the pictograms Skull and crossbones and Environment and the signal word is Danger.
Is Methomyl flammable?
CLP Annex VI assigns Methomyl no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Methomyl a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Methomyl. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the exposure limit for Methomyl?
The US occupational exposure limit reported for Methomyl is none See Appendix G (The National Institute for Occupational Safety and Health (NIOSH)). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.
What is the boiling point of Methomyl?
The boiling point reported for Methomyl is 335 °C (635 °F), at 760 mmHg (DOE PAC).
What is the melting point of Methomyl?
The melting point reported for Methomyl is 77.78 °C (172 °F) (NIOSH).
How should Methomyl be stored?
Keep /liq formulations/ away from heat, sparks, & open flame. Do not subject liquid to temperatures below 32 °F. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Methomyl
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