Substance profile
Acephate
Acephate is colorless crystals.
01 · Identification
What Acephate is
Acephate is colorless crystals. Its molecular formula is C4H10NO3PS and its molecular weight is 183.17 g/mol. It melts at 85.5 °C.
Under the GHS it carries the signal word Warning. It is classed as carcinogens.
Other names for Acephate
- acephate (ISO)
- O,S-dimethyl acetylphosphoramidothioate
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. |
03 · Physical and chemical properties
Acephate 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 |
|---|---|---|---|
| Melting point | 85.5 °C (185.9 °F) | range, midpoint shown | HSDB |
| 92.5 °C (198.5 °F) | range, midpoint shown | ICSC | |
| Density | 1.35 g/cm³ | HSDB | |
| 1.4 g/cm³ | ICSC | ||
| Solubility | Solubilities in various solvents. [Table#6047] | HSDB | |
| Low solubility in aromatic solvents. | HSDB | ||
| In water, 818,000 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 0.0000015 mmHg | at 24 °C | ICSC |
| 0.0000017 mmHg | at 25 °C | HSDB | |
| 0.0000017 mmHg | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Acephate
Storage conditions
Rooms used for storage only should be soundly constructed & fitted with secure locks. Floors should be kept clear & pesticides clearly identified. If repacking is carried out in storage rooms, adequate light should be available; floors should be impervious & sound ... . /Pesticides/
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
A thiophosphate ester. Organothiophosphates 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.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Acephate in the storage compatibility matrix →