Substance profile
Chlorpyrifos
Chlorpyrifos is white granular crystals with a mild mercaptan odor.
01 · Identification
What Chlorpyrifos is
Chlorpyrifos is white granular crystals with a mild mercaptan odor. It boils at 160 °C, melts at 42.2 °C.
Under the GHS it carries the signal word Danger.
Other names for Chlorpyrifos
- chlorpyrifos (ISO)
- O,O-diethyl O-3,5,6-trichloro-2-pyridyl 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 |
|---|---|
| H301 | Toxic if swallowed. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P270, P273, P301, P310, P330, P391, P501
03 · Physical and chemical properties
Chlorpyrifos 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 | 160 °C (320 °F) | HSDB | |
| 160 °C (320 °F) | decomposes | NIOSH | |
| 160 °C (320 °F) | decomposes, at 760 mmHg | CAMEO | |
| Melting point | 42.22 °C (108 °F) | NIOSH | |
| 41.5 °C (106.7 °F) | range, midpoint shown | HSDB | |
| Density | 1.4 g/cm³ | ICSC | |
| 1.44 g/cm³ | at 20 °C | HSDB | |
| Solubility | In water, 1.12 mg/L at 24 °C | at 24 °C | HSDB |
| In water, 0.39 mg/L at 19.5 °C | at 19.5 °C, OECD 105 method | HSDB | |
| In water, 1.4 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 0.00002 mmHg | NIOSH | |
| 0.0000202 mmHg | at 25 °C | HSDB | |
| 0.0000187 mmHg | at 25 °C | CAMEO | |
| Flash point | 27.78 °C (82 °F) | HSDB | |
| 30.56 °C (87 °F) | HSDB | ||
| Lower explosive limit (LEL) | Combustible Solid | NIOSH | |
| Vapor density | 12.09 (air = 1) | calculated | CAMEO |
| 12.09 (air = 1) | OSHA | ||
| Corrosivity | Corrosive to copper and brass | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Chlorpyrifos
Storage conditions
Do not contaminate water, food or feed by storage or disposal. Open dumping is prohibited. ... Store in original container in secured dry storage area. Prevent cross-contamination with other pesticides and fertilizers. Do not store above 1002F for extended periods of time. If container is damaged or spills occurs, use product immediately or dispose of product ... . /Dursban W/
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Incompartible Materials: Brass
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
CHLORPYRIFOS is sensitive to heat and is decomposed by moisture. This chemical is hydrolyzed by strong alkalis. It is corrosive to copper and brass. It is also corrosive to copper alloys. It reacts with water and most reactive hydrogen compounds. The rate of hydrolysis in water increases with pH, with temperature and with the presence of copper and possibly other metals that can form chelates. (NTP, 1992)
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Chlorpyrifos in the storage compatibility matrix →