Substance profile
Monocrotophos
Monocrotophos is a reddish brown solid with a mild, ester odor.
01 · Identification
What Monocrotophos is
Monocrotophos is a reddish brown solid with a mild, ester odor. Its molecular formula is C7H14NO5P and its molecular weight is 223.16 g/mol. It boils at 125 °C, melts at 53.9 °C.
Under the GHS it carries the signal word Danger.
Other names for Monocrotophos
- monocrotophos (ISO)
- dimethyl-1-methyl-2-(methylcarbamoyl)vinyl phosphate
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 |
|---|---|
| H341 | Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H330 | Fatal if inhaled. |
| H300 | Fatal if swallowed. |
| H311 | Toxic in contact with skin. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P201, P260, P270, P271, P273, P280, P301, P302, P304, P308, P310, P313, P330, P352, P391, P501
03 · Physical and chemical properties
Monocrotophos 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 | 125 °C (257 °F) | at 760 mmHg | HSDB |
| 125 °C (257 °F) | NIOSH | ||
| Melting point | 53.89 °C (129 °F) | NIOSH | |
| 54.5 °C (130.1 °F) | range, midpoint shown | HSDB | |
| Density | 1.22 g/cm³ | at 20 °C | HSDB |
| Solubility | SOL IN WATER, ETHANOL, PETROLEUM ETHER, ACETONE | TECHNICAL GRADE | HSDB |
| MISCIBLE WITH WATER; SOL IN ACETONE, ETHANOL; PRACTICALLY INSOL IN DIESEL OILS, KEROSINE. | HSDB | ||
| Solubility (20 °C) 1 kg/kg water; 700 g/kg acetone; 800 g/kg dichloromethane; 1 kg/kg methanol; 250 g/kg octan-1-ol; 60 g/kg toluene. | at 20 °C | HSDB | |
| Vapor pressure | 0.000007 mmHg | NIOSH | |
| 0.000002175 mmHg | at 20 °C | HSDB | |
| 0.000007 mmHg | at 20 °C | CAMEO | |
| Flash point | 93.33 °C (200 °F) | above this value | HSDB |
| Lower explosive limit (LEL) | Combustible Solid | NIOSH | |
| Corrosivity | Non-corrosive to aluminum. | HSDB | |
| CORROSIVE TO BLACK IRON, DRUM STEEL, STAINLESS STEEL 304 & BRASS. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Monocrotophos
Storage conditions
DO NOT STORE /AZODRIN 5/ BELOW 70 °F OR ABOVE 80 °F FOR PROLONGED PERIODS. AZODRIN 5 IS EXTREMELY FLAMMABLE.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
... Incompatible with /pesticides/ which are alkaline in reaction.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
MONOCROTOPHOS is incompatible with the following: Metals, low molecular weight alcohols & glycols [Note: Corrosive to black iron, drum steel, stainless steel 304 & brass. Should be stored at 70-80 °F.] (NIOSH, 2024). Incompatible with alkaline compounds.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Monocrotophos in the storage compatibility matrix →