Substance profile
Pirimiphos-methyl
Pirimiphos-methyl is a straw-colored liquid.
01 · Identification
What Pirimiphos-methyl is
Pirimiphos-methyl is a straw-colored liquid. Its molecular formula is C11H20N3O3PS and its molecular weight is 305.34 g/mol. It melts at 16.5 °C.
Under the GHS it carries the signal word Danger.
Other names for Pirimiphos-methyl
- pirimiphos-methyl (ISO)
- O-[2-(diethylamino)-6-methylpyrimidin-4-yl] O,O-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 |
|---|---|
| H302 | Harmful if swallowed. |
| H372 | Causes damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P260, P270, P273, P301, P312, P314, P330, P391, P501
03 · Physical and chemical properties
Pirimiphos-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 | Decomposes on distillation | decomposes | HSDB |
| decomposes | decomposes | OSHA | |
| Melting point | 16.5 °C (61.7 °F) | range, midpoint shown | HSDB |
| Density | 1.17 g/cm³ | at 20 °C | HSDB |
| Solubility | Miscible with most organic solvents | HSDB | |
| In water (mg/L at 20 °C): 11 (pH 5); 10 (pH 7); 9.7 (pH 9) | at 20 °C | HSDB | |
| In water, 5 mg/L at 30 °C | at 30 °C | HSDB | |
| Vapor pressure | 0.000015 mmHg | OSHA | |
| 15000 mmHg | at 20 °C | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Pirimiphos-methyl
Storage conditions
Do not use or store near heat or open flame. /Actellic 5E Insecticide Low Odor Formulation/
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Pirimiphos-methyl is hydrolyzed by strong acids & alkalies.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
Organophosphates 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 Pirimiphos-methyl in the storage compatibility matrix →