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.
Other names for Diazinon
- diazinon (ISO)
- O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate
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 |
|---|---|
| H302 | Harmful if swallowed. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P270, P273, P301, P312, P330, P391, P501
03 · 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.
| 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 | |
| Melting point | 25 °C (77 °F) | below this value | HMDB |
| Density | 1.12 g/cm³ | NIOSH | |
| 1.1 g/cm³ | ICSC | ||
| 1.117 g/cm³ | at 20 °C | CAMEO | |
| 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 | |
| Vapor pressure | 0.0001 mmHg | NIOSH | |
| 0.0000901 mmHg | at 25 °C | HSDB | |
| Flash point | 82.22 °C (180 °F) | NIOSH | |
| 104.4 °C (219.9 °F) | ICSC | ||
| Autoignition temperature | 400 °C (752 °F) | above this value, Diazinon 50W | HSDB |
| 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.
04 · Handling and storage
Storing and handling 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)
Incompatible materials
Strong acids and alkalis, copper containing compounds [Note: Hydrolyzes slowly in water and dilute acid].
Source: Hazardous Substances Data Bank (HSDB)
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 →