Substance profile
Pentachlorobenzene
Pentachlorobenzene is colorless needles with a pleasant aroma odor.
01 · Identification
What Pentachlorobenzene is
Pentachlorobenzene is colorless needles with a pleasant aroma odor. Its molecular formula is C6HCl5 and its molecular weight is 250.3 g/mol. It boils at 277 °C, melts at 86 °C.
Under the GHS it carries the signal word Danger.
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 |
|---|---|
| H228 | Flammable solid. |
| 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
Pentachlorobenzene 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 | 277 °C (530.6 °F) | HSDB | |
| 277.22 °C (531 °F) | at 760 mmHg | CAMEO | |
| 277 °C (530.6 °F) | at 760 mmHg | DOE PAC | |
| Melting point | 86 °C (186.8 °F) | HSDB | |
| 86.11 °C (187 °F) | CAMEO | ||
| Density | 1.8342 g/cm³ | CAMEO | |
| 1.8 g/cm³ | ICSC | ||
| 1.8342 g/cm³ | at 16.5 °C | HSDB | |
| Solubility | In water, 0.18 to 1.34 mg/L at 22-25 °C | HSDB | |
| Insoluble in ethanol; slightly soluble in ether, benzene, chloroform and carbon disulfide | HSDB | ||
| In water, 0.831 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 0.002 mmHg | at 25 °C | HSDB |
| 0.0065 mmHg | at 25 °C | DOE PAC | |
| 0.0065 mmHg | Haz-Map | ||
| Vapor density | 8.6 (air = 1) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Pentachlorobenzene
Storage conditions
Keep container tightly closed in a dry and well-ventilated place.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
... On contact with acids or acid fumes ... /chlorides/ evolve highly toxic /hydrogen chloride/ fumes. /Chlorides/
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
PENTACHLOROBENZENE is relatively unreactive. May be incompatible with strong oxidizing and reducing agents. Also may be incompatible with many amines, nitrides, azo/diazo compounds, alkali metals, and epoxides.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Pentachlorobenzene in the storage compatibility matrix →