Substance profile
Diazinon
Diazinon is a colorless oil with a faint ester-like odor.
01 · Identification
What Diazinon is
Diazinon is a colorless oil with a faint ester-like odor. Its molecular formula is C12H21N2O3PS and its molecular weight is 304.35 g/mol. It boils at 120 °C, melts at 25 °C.
Under the GHS it carries the signal word Warning. It is classed as teratogens.
02 · Identifiers
Diazinon identifiers and molecular data
Diazinon CAS number and EC number
Diazinon molecular formula and molecular weight
Other names for Diazinon
- diazinon (ISO)
- O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate
03 · GHS classification
Diazinon hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Diazinon pictograms and signal word
Diazinon hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 4 | H302 | GHS07 |
| 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 |
Diazinon hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H302 | Harmful if swallowed. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Diazinon. 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 Diazinon
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 Diazinon 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
Diazinon precautionary statements
CLP Annex VI assigns 7 precautionary statements to Diazinon. 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
Diazinon 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 | диазинон (ISO) O , O -диетилов О -2-изопропил-6-метилпиримидин-4-илов фосфоротиоат |
| Spanish español | Diazinón (ISO) fosforotioato de O , O -dietilo y O -2-isopropil-6-metilpirimidin-4-ilo |
| Czech čeština | diazinon (ISO) O, O -diethyl- O -(2-isopropyl-6-methylpyrimidin-4-yl)-fosforothioát |
| Danish dansk | diazinon (ISO) O, O- diethyl- O- 2-isopropyl-6-methylpyrimidin-4-ylthiophosphat |
| German Deutsch | Diazinon (ISO) O , O -Diethyl- O -2-isopropyl-6-methylpyrimidin-4-ylphosphorothioat |
| Estonian eesti | diasinoon (ISO) O , O -dietüül- O -2-isopropüül-6-metüülpürimidiin-4-üülfosforotioaat |
| Greek ελληνικά | diazinon (διαζινόνη) (ISO) θειοφωσφορικό O , O -διαιθύλιο O -2-ισοπροπυλο-6-μεθυλοπυριμιδιν-4-ύλιο |
| English English | diazinon (ISO) O , O -diethyl O -2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate |
| French français | diazinon (ISO) phosphorothioate de O , O -diéthyle et de O -2-isopropyl-6-méthylpyrimidin-4-yle |
| Croatian hrvatski | diazinon (ISO) O , O -dietil- O -2-izopropil-6-metil-pirimidin-4-il-fosforotioat |
| Italian italiano | diazinon (ISO) tiofosfato di O, O-dietile e O-2-isopropil-6-metilpirimidin-4-ile |
| Latvian latviešu | diazinons (ISO) O , O -dietil- O -2-izopropil-6-metilpirimidīn-4-ilfosfortioāts |
| Lithuanian lietuvių | diazinonas (ISO) O , O -dietil- O -2-izopropil-6-metilpirimidin-4-iltiofosfatas |
| Hungarian magyar | diazinon (ISO) O , O -dietil O -2-izopropil-6-metilpirimidin-4-il-tiofoszfát |
| Maltese Malti | diażinon (ISO) fosforotijoat ta’ O , O -dietil O -2-isopropil-6-metilpirimidin-4-il |
| Dutch Nederlands | diazinon (ISO) O , O -diëthyl- O -2-isopropyl-6-methylpyrimidine-4-ylthiofosfaat |
| Polish polski | diazynon (ISO) tiofosforan O , O -dietylu- O -2-izopropylo-6-metylopirymidyn-4-ylu |
| Portuguese português | diazinão (ISO) tiofosfato de O , O -dietilo e de O -2-isopropil-6-metil-4-pirimidinilo |
| Romanian română | diazinon (ISO) tiofosfat de O, O -dietil și de O -2-izopropil-6- metilpirimidin-4-il |
| Slovak slovenčina | diazinón (ISO) O, O -dietyl- O -(2-izopropyl-6- metylpyrimidín-4-yl)-fosforotioát |
| Slovenian slovenščina | diazinon (ISO) O , O -dietil O -2-izopropil-6-metilpirimidin-4-il fosforotioat |
| Finnish suomi | diatsinoni (ISO) O , O -dietyyli- O -2-isopropyyli-6-metyylipyrimidin-4-yyli |
| Swedish svenska | diazinon (ISO) O , O -dietyl- O -2-isopropyl-6-metylpyrimidin-4-ylfosfortioat |
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
Diazinon GHS label elements
Everything CLP Annex VI fixes for Diazinon, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
Diazinon
- Harmful if swallowed.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Do not eat, drink or smoke when using this product.
- Avoid release to the environment.
- IF SWALLOWED:
- Call a POISON CENTER/doctor/… if you feel unwell.
- Rinse mouth.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Diazinon in the GHS label constructor →
07 · Health hazards
Diazinon health hazards and exposure limits
Diazinon hazard summary
Diazinon is the common name of an organophosphorus pesticide used to control pest insects in soil, on ornamental plants, and on fruit and vegetable field crops. It was formerly used as the active ingredient in household and garden products used to control pests such as flies, fleas, and cockroaches. Diazinon is a synthetic chemical, it does not occur naturally in the environment. Pure diazinon is colorless and practically odorless oil. Preparations used in agriculture and by exterminators contain 85-90% diazinon and appear as a pale to dark-brown liquid. Diazinon preparations sold in the past for home and garden use contained 1-5% diazinon in a liquid or as solid granules. Most diazinon used is in liquid form, but it is possible to be exposed to the solid form. Diazinon does not dissolve easily in water and does not burn easily.
Source: Agency for Toxic Substances and Disease Registry (ATSDR)
Diazinon carcinogenicity classification
Studied by the US National Toxicology Program: TR-137: Bioassay of Diazinon for Possible Carcinogenicity (CASRN 333-41-5) (1979 )
Cancer Classification: Not 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.
Diazinon occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | none See Appendix G | The National Institute for Occupational Safety and Health (NIOSH) |
| REL | 0.1 mg/m³ | Occupational Safety and Health Administration (OSHA) |
| REL | TWA 0.1 mg/m3 [skin] | 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
Diazinon 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.
Diazinon boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 120 °C (248 °F) | above this value | CAMEO |
| 125 °C (257 °F) | at 1 mmHg (reduced pressure) | HSDB | |
| Decomposes | decomposes | NIOSH |
Diazinon melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 25 °C (77 °F) | below this value | HMDB |
Diazinon density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.12 g/cm³ | NIOSH | |
| 1.1 g/cm³ | ICSC | ||
| 1.117 g/cm³ | at 20 °C | CAMEO |
Diazinon solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Completely miscible with common organic solvents, e.g. ethers, alcohols, benzene, toluene, hexane, cyclohexane, dichloromethane, acetone, petroleum oils. | HSDB | |
| Freely soluble in ketones | HSDB | ||
| Solubility in water: 0.004% at 20 °C | at 20 °C | HSDB |
Diazinon vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.0001 mmHg | NIOSH | |
| 0.0000901 mmHg | at 25 °C | HSDB |
Diazinon flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | 82.22 °C (180 °F) | NIOSH | |
| 104.4 °C (219.9 °F) | ICSC |
Diazinon autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | 400 °C (752 °F) | above this value, Diazinon 50W | HSDB |
Diazinon lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Class IIIA Combustible Liquid: Fl.P. at or above 140 °F and below 200 °F. | NIOSH |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Diazinon 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.
Diazinon fire potential
PRACTICALLY NONFLAMMABLE.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Diazinon storage and handling
Diazinon safe storage
Provision to contain effluent from fire extinguishing. Separated from strong oxidants, strong acids, bases and food and feedstuffs. Keep in a well-ventilated room. Store in an area without drain or sewer access.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Diazinon storage conditions
Store in original container only in cool, dry, well-ventilated, secure area out of reach of children and animals.
Source: Hazardous Substances Data Bank (HSDB)
Diazinon incompatible materials
Strong acids and alkalis, copper containing compounds [Note: Hydrolyzes slowly in water and dilute acid].
Source: Hazardous Substances Data Bank (HSDB)
Diazinon reactivity
Organothiophosphates, such as DIAZINON, 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. POISONOUS GASES ARE PRODUCED WHEN HEATED. Oxides of sulfur and of phosphorus are generated in fires (USCG, 1999).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Diazinon in the storage compatibility matrix →
11 · Questions
Diazinon — frequently asked questions
What is the CAS number of Diazinon?
The CAS number of Diazinon is 333-41-5. Its EC number is 206-373-8.
What is the chemical formula of Diazinon?
The molecular formula of Diazinon is C12H21N2O3PS and its molecular weight is 304.35 g/mol.
What does a Diazinon label have to show?
Under CLP Annex VI the label for Diazinon carries the pictograms Exclamation mark and Environment and the signal word is Warning.
Is Diazinon flammable?
CLP Annex VI assigns Diazinon 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. The flash point reported for it is 82.22 °C (180 °F) (NIOSH).
Is Diazinon a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Diazinon. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health. IARC places it in Group 2A: probably carcinogenic to humans.
What is the exposure limit for Diazinon?
The US occupational exposure limit reported for Diazinon 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 Diazinon?
The boiling point reported for Diazinon is 120 °C (248 °F), above this value (CAMEO).
What is the melting point of Diazinon?
The melting point reported for Diazinon is 25 °C (77 °F), below this value (HMDB).
How should Diazinon be stored?
Store in original container only in cool, dry, well-ventilated, secure area out of reach of children and animals. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Diazinon
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