Substance profile
Diuron
Diuron is a white, crystalline solid and is odorless.
01 · Identification
What Diuron is
Diuron is a white, crystalline solid and is odorless. Its molecular formula is C9H10Cl2N2O and its molecular weight is 233.09 g/mol. It boils at 185 °C, melts at 158 °C.
Under the GHS it carries the signal word Danger.
Other names for Diuron
- diuron (ISO)
- 3-(3,4-dichlorophenyl)-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 |
|---|---|
| H350 | May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H373 | May cause 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: P201, P260, P270, P273, P280, P308, P313, P314, P391, P501
03 · Physical and chemical properties
Diuron 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 | 185 °C (365 °F) | range, midpoint shown | HSDB |
| 185 °C (365 °F) | range, midpoint shown, at 760 mmHg | CAMEO | |
| 180 °C (356 °F) | decomposes | NIOSH | |
| Melting point | 157.78 °C (316 °F) | NIOSH | |
| 159 °C (318.2 °F) | CAMEO | ||
| Density | 1.48 g/cm³ | HSDB | |
| Solubility | Very low solubility in hydrocarbon solvents | HSDB | |
| In water, 42.0 mg/L at 25 °C | at 25 °C | HSDB | |
| In water, 37.4 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 2e-9 mmHg | NIOSH | |
| 6.9e-8 mmHg | at 25 °C | HSDB | |
| 8.25e-9 mmHg | at 25 °C | HSDB | |
| Lower explosive limit (LEL) | Noncombustible Solid | NIOSH | |
| 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 Diuron
Storage conditions
Keep container tightly closed in a dry and well-ventilated place. Keep in a dry place.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Incompatible materials: Strong oxidizing agents, strong acids, strong bases.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
DIURON is incompatible with the following: Strong acids (NIOSH, 2024).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Diuron in the storage compatibility matrix →