Substance profile
Monuron
Monuron is white plates from methanol with a slight odor.
01 · Identification
What Monuron is
Monuron is white plates from methanol with a slight odor. Its molecular formula is C9H11ClN2O and its molecular weight is 198.65 g/mol. It boils at 193 °C, melts at 171 °C.
Under the GHS it carries the signal word Warning.
Other names for Monuron
- monuron (ISO)
- 3-(4-chlorophenyl)-1,1-dimethylurea
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 |
|---|---|
| H351 | Suspected of causing cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H302 | Harmful if swallowed. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P201, P270, P273, P280, P301, P308, P312, P313, P330, P391, P501
03 · Physical and chemical properties
Monuron 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 | 192.5 °C (378.5 °F) | range, midpoint shown, at 760 mmHg | CAMEO |
| Melting point | 171 °C (339.8 °F) | range, midpoint shown | HSDB |
| Density | 1.27 g/cm³ | at 20 °C | HSDB |
| Solubility | VERY SLIGHTLY SOL IN NUMBER 3 DIESEL OIL; MODERATELY SOL IN METHANOL, ETHANOL, PRACTICALLY INSOL IN HYDROCARBON SOLVENTS | HSDB | |
| SLIGHTLY SOL IN OIL & POLAR SOLVENTS | HSDB | ||
| Vapor pressure | 502.541 mmHg | at 25 °C | HSDB |
| 5e-7 mmHg | at 25 °C | CAMEO | |
| 5e-7 mmHg | Haz-Map | ||
| Corrosivity | NON-CORROSIVE | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Source notes
Further notes on Monuron
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.
Solubility
Monuron-TCA is a crystalline solid; mp 78-81 °C. Solubility (room temperature): 918 mg/l water; 400 g/kg 1,2-dichloroethane; 177 g/kg methanol; 91 g/kg xylene. It is acidic in reaction and incompatible with alkaline materials. /Monuron Trichloroacetate/
Source: HSDB
05 · Handling and storage
Storing and handling Monuron
Storage conditions
Keep in well ventilated area.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
MONURON is a chlorinated urea derivative. May react with azo and diazo compounds to generate toxic gases. May react with strong reducing agents to generate flammable gases. Reacts as a weak base. Combustion generates mixed oxides of nitrogen (NOx).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Monuron in the storage compatibility matrix →