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.
02 · Identifiers
Diuron identifiers and molecular data
Diuron CAS number and EC number
Diuron molecular formula and molecular weight
Other names for Diuron
- diuron (ISO)
- 3-(3,4-dichlorophenyl)-1,1-dimethylurea
03 · GHS classification
Diuron hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Diuron pictograms and signal word
Diuron hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Carcinogenicity GHS chapter 3.6 | Category 1A or 1B | H350 | GHS08 |
| Specific target organ toxicity - repeated exposure GHS chapter 3.9 | Category 2 | H373 | GHS08 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Diuron hazard statements (H-codes)
| 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. |
This page lists only the codes assigned to Diuron. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Diuron
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Diuron issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Diuron precautionary statements
CLP Annex VI assigns 10 precautionary statements to Diuron. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Diuron name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | диурон (ISO) 3-(3,4-дихлорофенил)-1,1-диметилуреа |
| Spanish español | Diurón (ISO) 3-(3,4-diclorofenil)-1,1-dimetilurea |
| Czech čeština | diuron (ISO) 3-(3,4-dichlorfenyl)-1,1-dimethylmočovina |
| Danish dansk | diuron (ISO) 3-(3,4-dichlorphenyl)-1,1-dimethylurinstof |
| German Deutsch | Diuron (ISO) 3-(3,4-Dichlorphenyl)-1,1-dimethylharnstoff |
| Estonian eesti | diuroon (ISO) 3-(3,4-diklorofenüül)-1,1-dimetüüluurea |
| Greek ελληνικά | diuron (διουρόνη) (ISO) 3-(3,4-διχλωροφαινυλο)-1,1-διμεθυλουρία |
| English English | diuron (ISO) 3-(3,4-dichlorophenyl)–1,1-dimethylurea |
| French français | diuron (ISO) 3-(3,4-dichlorophényl)-1,1-diméthylurée |
| Croatian hrvatski | diuron (ISO) 3-(3,4-diklorfenil)-1,1-dimetil-urea |
| Italian italiano | diuron (ISO) 3-(3,4-diclorofenil)-1,1-dimetilurea |
| Latvian latviešu | diurons (ISO) 3-(3,4-dihlorofenil)-1,1-dimetilurīnviels |
| Lithuanian lietuvių | diuronas (ISO) 3-(3,4-dichlorfenil)-1,1-dimetilkarbamidas |
| Hungarian magyar | diuron (ISO) 3-(3,4-diklórfenil)-1,1-dimetilkarbamid |
| Maltese Malti | djuron (ISO) 3-(3,4-diklorofenil)-1,1-dimetilurea |
| Dutch Nederlands | diuron (ISO) 3-(3,4-dichloorfenyl)-1,1-dimethylureum |
| Polish polski | diuron (ISO) 3-(3,4-dichlorofenylo)-1,1-dimetylomocznik |
| Portuguese português | diurão (ISO) 3-(3,4-diclorofenil)–1,1-dimetilureia |
| Romanian română | diuron (ISO) 3-(3,4-diclorfenil)-1,1-dimetiluree |
| Slovak slovenčina | diurón (ISO) 3-(3,4-dichlórfenyl)-1,1-dimetylmočovina |
| Slovenian slovenščina | diuron (ISO) 3-(3,4-diklorofenil)-1,1-dimetilsečnina |
| Finnish suomi | diuroni (ISO) 3-(3,4-dikloorifenyyli)-1,1-dimetyyliurea |
| Swedish svenska | diuron (ISO) 3-(3,4-diklorfenyl)-1,1-dimetylurea |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Diuron GHS label elements
Everything CLP Annex VI fixes for Diuron, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Diuron
- May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- 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>.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Obtain special instructions before use.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Do not eat, drink or smoke when using this product.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF exposed or concerned:
- Get medical advice/attention.
- Get medical advice/attention if you feel unwell.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Diuron in the GHS label constructor →
07 · Health hazards
Diuron health hazards and exposure limits
Diuron hazard summary
Urea-derived herbicides have low toxicity in animal feeding studies; May induce methemoglobinemia; [HSDB] Systemic toxicity unlikely unless large amounts ingested; [EPA Pesticides, p. 122] Skin and mucous membrane irritation have been reported with the use of diuron. [ACGIH]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Diuron carcinogenicity classification
Cancer Classification: Known/ Likely /to be Carcinogenic to Humans/
Source: Hazardous Substances Data Bank (HSDB)
An IARC group and a CLP classification answer different questions. IARC judges whether the evidence for cancer in humans is strong enough; CLP Annex VI is the legally binding EU classification. A substance can carry one and not the other.
Diuron occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | none See Appendix G | The National Institute for Occupational Safety and Health (NIOSH) |
| REL | 10 mg/m³ | Occupational Safety and Health Administration (OSHA) |
| REL | TWA 10 mg/m3 | The National Institute for Occupational Safety and Health (NIOSH) |
| IDLH | N.D. | The National Institute for Occupational Safety and Health (NIOSH) |
These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.
08 · 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.
Diuron boiling point
| 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 |
Diuron melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 157.78 °C (316 °F) | NIOSH | |
| 159 °C (318.2 °F) | CAMEO |
Diuron density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.48 g/cm³ | HSDB |
Diuron solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| 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 |
Diuron vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 2e-9 mmHg | NIOSH | |
| 6.9e-8 mmHg | at 25 °C | HSDB | |
| 8.25e-9 mmHg | at 25 °C | HSDB |
Diuron lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Noncombustible Solid | NIOSH |
Diuron corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | Non-corrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Diuron fire and explosion behaviour
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.
Diuron fire potential
Diuron may burn, but does not readily ignite.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Diuron storage 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)
Diuron incompatible materials
Incompatible materials: Strong oxidizing agents, strong acids, strong bases.
Source: Hazardous Substances Data Bank (HSDB)
Diuron 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 →
11 · Questions
Diuron — frequently asked questions
What is the CAS number of Diuron?
The CAS number of Diuron is 330-54-1. Its EC number is 206-354-4.
What is the chemical formula of Diuron?
The molecular formula of Diuron is C9H10Cl2N2O and its molecular weight is 233.09 g/mol.
What does a Diuron label have to show?
Under CLP Annex VI the label for Diuron carries the pictograms Health hazard and Environment and the signal word is Danger.
Is Diuron flammable?
CLP Annex VI assigns Diuron no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Diuron a carcinogen?
Yes. CLP Annex VI classifies Diuron as a category 1A or 1B carcinogen and assigns it H350: may cause cancer.
What is the exposure limit for Diuron?
The US occupational exposure limit reported for Diuron is none See Appendix G (The National Institute for Occupational Safety and Health (NIOSH)). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.
What is the boiling point of Diuron?
The boiling point reported for Diuron is 185 °C (365 °F), range, midpoint shown (HSDB).
What is the melting point of Diuron?
The melting point reported for Diuron is 157.78 °C (316 °F) (NIOSH).
How should Diuron be stored?
Keep container tightly closed in a dry and well-ventilated place. Keep in a dry place. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Diuron
Keep going: substances starting with D, or search the whole database by name, CAS number, pictogram or signal word.