Substance profile
Demeton-S-methyl
Demeton-S-methyl is an oily colorless to pale yellow liquid with an unpleasant odor.
01 · Identification
What Demeton-S-methyl is
Demeton-S-methyl is an oily colorless to pale yellow liquid with an unpleasant odor. Its molecular formula is C6H15O3PS2 and its molecular weight is 230.3 g/mol.
Under the GHS it carries the signal word Danger.
Other names for Demeton-S-methyl
- demeton-S-methyl (ISO)
- S-2-ethylthioethyl dimethyl phosphorothioate
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
| H411 | Toxic to aquatic life with long lasting effects. |
Precautionary statements: P270, P273, P280, P301, P302, P310, P330, P352, P391, P501
03 · Physical and chemical properties
Demeton-S-methyl 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.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 74 °C (165.2 °F) | at 0.15 mmHg (reduced pressure) | HSDB |
| 88.89 °C (192 °F) | at 0.15 mmHg (reduced pressure) | CAMEO | |
| 118 °C (244.4 °F) | at 0.97508 mmHg (reduced pressure) | ICSC | |
| Density | 1.2 g/cm³ | ICSC | |
| 1.21 g/cm³ | at 20 °C | HSDB | |
| 1.207 g/cm³ | at 20 °C | CAMEO | |
| Solubility | Sol in organic solvents | HSDB | |
| Limited solubility in petroleum solvents. Readily soluble in most organic solvents (e.g. dischloromethane, propanol, toluene) | HSDB | ||
| 600 g/kg dichloromethane at 20 °C; 600 g/kg propan-2-ol at 20 °C | at 20 °C | HSDB | |
| Vapor pressure | 0.0003 mmHg | at 20 °C | HSDB |
| 0.00036 mmHg | at 20 °C | CAMEO | |
| Vapor density | 7.9 (air = 1) | ICSC | |
| Odor threshold | 1.0X10-2 mg/L (liqiuid) (detection in water, purity not specified) | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Demeton-S-methyl
Storage conditions
Rooms used for storage only should be soundly constructed & fitted with secure locks. Floors should be kept clear & pesticides clearly identified. If repacking is carried out in storage rooms, adequate light should be available; floors should be impervious & sound ... . /Pesticides/
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
... incompatible with alkaline materials.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
Organophosphates, such as DEMETON-S-METHYL, are susceptible to formation of highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Demeton-S-methyl in the storage compatibility matrix →