Substance profile
Methidathion
Methidathion is colorless crystals with an organophosphate odor.
01 · Identification
What Methidathion is
Methidathion is colorless crystals with an organophosphate odor. Its molecular formula is C6H11N2O4PS3 and its molecular weight is 302.3 g/mol. It melts at 39 °C.
Under the GHS it carries the signal word Danger. It is classed as carcinogens.
Other names for Methidathion
- methidathion (ISO)
- 2,3-dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-ylmethyl-O,O-dimethylphosphorodithioate
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 |
|---|---|
| H300 | Fatal if swallowed. |
| H312 | Harmful in contact with skin. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P270, P273, P280, P301, P302, P310, P312, P330, P352, P391, P501
03 · Physical and chemical properties
Methidathion 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 |
|---|---|---|---|
| Melting point | 39 °C (102.2 °F) | HSDB | |
| 39.44 °C (103 °F) | range, midpoint shown | CAMEO | |
| Density | 1.5 g/cm³ | ICSC | |
| 1.51 g/cm³ | at 20 °C | HSDB | |
| 1.495 g/cm³ | at 20 °C | CAMEO | |
| Solubility | Solubility (all in g/L at 20 °C): ethanol (150); acetone (670); toluene (720); hexane (11); n-octanol (14) | at 20 °C | HSDB |
| In water, 187 mg/L at 20 °C | at 20 °C | HSDB | |
| Soluble in benzene, methanol and xylene at >60 g/100 mL at 25 °C. Moderately soluble in chloroform and dichloromethane. | at 25 °C | HSDB | |
| Vapor pressure | 0.000001 mmHg | OSHA | |
| 0.000001 mmHg | at 20 °C | CAMEO | |
| 0.00000337 mmHg | at 25 °C | HSDB | |
| Flash point | 100 °C (212 °F) | ICSC | |
| Corrosivity | Non-corrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Methidathion
Storage conditions
Store in dry, well-ventilated, secure area out of reach of children and animals.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
Organophosphates, such as METHIDATHION, 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 Methidathion in the storage compatibility matrix →