Substance profile
Captan
Captan is a white to cream powder and is odorless.
01 · Identification
What Captan is
Captan is a white to cream powder and is odorless. Its molecular formula is C9H8Cl3NO2S and its molecular weight is 300.6 g/mol. It melts at 173 °C.
Under the GHS it carries the signal word Danger. It is classed as hazardous Air Pollutants (HAPs).
Other names for Captan
- captan (ISO)
- 1,2,3,6-tetrahydro-N-(trichloromethylthio)phthalimide
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 |
|---|---|
| H351 | Suspected of causing cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H331 | Toxic if inhaled. |
| H318 | Causes serious eye damage. |
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
Precautionary statements: P201, P260, P261, P271, P272, P273, P280, P304, P305, P308, P310, P313, P333, P338, P391, P501
03 · Physical and chemical properties
Captan 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 | 172.5 °C (342.5 °F) | HSDB | |
| 177.78 °C (352 °F) | CAMEO | ||
| Density | 1.74 g/cm³ | NIOSH | |
| 1.74 g/cm³ | at 20 °C | CAMEO | |
| 1.74 g/cm³ | at 25 °C | HSDB | |
| Solubility | In water, 5.1 mg/L at 25 °C | at 25 °C | HSDB |
| 20 g/kg xylene; 21 g/kg acetone; 1.7 g/kg isopropanol; 23 g/kg cyclohexanone at 26 °C | at 26 °C | HSDB | |
| Vapor pressure | 0 mmHg | approx | NIOSH |
| 9e-8 mmHg | at 25 °C | HSDB | |
| Lower explosive limit (LEL) | Combustible Solid; may be dissolved in flammable liquids. | NIOSH | |
| Corrosivity | Noncorrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Source notes
Further notes on Captan
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
7.78 g/100 mL chloroform; 8.15 g/100 mL tetrachloroethane; 4.96 g/100 mL cyclohexanone; 4.70 g/100 mL dioxane; 2.13 g/100 mL benzene; 0.69 g/100 mL toluene; 0.04 g/100 mL heptane; 0.29 g/100 mL ethanol; 0.25 g/100 mL ether at 26 °C
Source: HSDB
05 · Handling and storage
Storing and handling Captan
Storage conditions
Keep container tightly closed in a dry and well-ventilated place. Storage class (TRGS 510): Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Incompatible materials: Strong bases
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
CAPTAN decomposes at or near the melting point. This chemical is incompatible with strong alkaline and oxidizing materials, sulfur and (sulfur + moisture). (NTP, 1992)
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Captan in the storage compatibility matrix →