Substance profile
Azinphos-Methyl
Azinphos-Methyl is yellowish crystals and is odorless.
01 · Identification
What Azinphos-Methyl is
Azinphos-Methyl is yellowish crystals and is odorless. Its molecular formula is C10H12N3O3PS2 and its molecular weight is 317.3 g/mol. It melts at 72.8 °C.
Under the GHS it carries the signal word Danger.
Other names for Azinphos-Methyl
- azinphos-methyl (ISO)
- O,O-dimethyl-4-oxobenzotriazin-3-ylmethyl phosphorodithioate
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 |
|---|---|
| H330 | Fatal if inhaled. |
| H300 | Fatal if swallowed. |
| H311 | Toxic in contact with skin. |
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P260, P261, P270, P271, P272, P273, P280, P301, P302, P304, P310, P313, P330, P333, P352, P391, P501
03 · Physical and chemical properties
Azinphos-Methyl 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 | Decomposes | decomposes | NIOSH |
| Decomposes (NTP, 1992) | decomposes | CAMEO | |
| decomposes | decomposes | OSHA | |
| Melting point | 72.78 °C (163 °F) | NIOSH | |
| 74 °C (165.2 °F) | DOE PAC | ||
| Density | 1.44 g/cm³ | NIOSH | |
| 1.44 g/cm³ | at 20 °C | HSDB | |
| Solubility | Soluble in methanol, ethanol, and propylene glycol, xylene, other organic solvents. | HSDB | |
| In toluene, dichloromethane, >20 g/L | HSDB | ||
| Vapor pressure | 8e-9 mmHg | NIOSH | |
| 2e-7 mmHg | at 20 °C | HSDB | |
| Lower explosive limit (LEL) | Noncombustible solid | NIOSH | |
| Odor threshold | Detection: 0.0002 mg/kg water | HSDB | |
| Corrosivity | Non-corrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Source notes
Further notes on Azinphos-Methyl
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
In dichloroethane, acetone, acetonitrile, ethyl acetate, and dimethyl sulfoxide, the solubility is >250 g/L at 20 °C; n-heptane, 1.2 g/L at 20 °C; xylene, 170 g/L at 20 °C
Source: HSDB
05 · Handling and storage
Storing and handling Azinphos-Methyl
Storage conditions
Store in a cool dry area, away from excessive heat or open flame. Store 2L formulation above 45 °F; others above 32 °F. Store in an area designated specifically for pesticides.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Incompatibilities: Contact with strong oxidizers may cause fires and explosions.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
The BPS Pesticide incident in Helena resulted in an explosion and death of three firemen. The burning of a 1,000 pound sack of Azinphos Methyl or the flashing of Maneb which was present on the facility may have caused the explosion. Azinphos Ethyl may behave similarly. At elevated temperatures, it will decompose generating toxic gases.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Azinphos-Methyl in the storage compatibility matrix →