Substance profile
Pyrogallol
Pyrogallol is white, lustrous crystals or plates and is odorless.
01 · Identification
What Pyrogallol is
Pyrogallol is white, lustrous crystals or plates and is odorless. Its molecular formula is C6H6O3 and its molecular weight is 126.11 g/mol. It boils at 309 °C, melts at 133 °C, is very soluble in water.
Under the GHS it carries the signal word Warning.
Other names for Pyrogallol
- 1,2,3-trihydroxybenzene
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 |
|---|---|
| H341 | Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H332 | Harmful if inhaled. |
| H312 | Harmful in contact with skin. |
| H302 | Harmful if swallowed. |
| H412 | Harmful to aquatic life with long lasting effects. |
Precautionary statements: P201, P260, P270, P271, P273, P280, P301, P302, P304, P308, P312, P313, P330, P352, P501
03 · Physical and chemical properties
Pyrogallol 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 | 309 °C (588.2 °F) | HSDB | |
| 309 °C (588.2 °F) | at 760 mmHg | DOE PAC | |
| Melting point | 133 °C (271.4 °F) | HSDB | |
| 133.33 °C (272 °F) | range, midpoint shown | CAMEO | |
| 132.5 °C (270.5 °F) | range, midpoint shown | ICSC | |
| Density | 1.45 g/cm³ | ICSC | |
| 1.45 g/cm³ | at 20 °C | CAMEO | |
| 1.453 g/cm³ | at 4 °C | HSDB | |
| Solubility | Very soluble in ethanol, diethyl ether | HSDB | |
| 1 g dissolves in 1.7 mL water, 1.3 mL alcohol, 1.6 mL ether; slightly sol in benzene, chloroform, carbon disulfide | HSDB | ||
| Soluble in oxygenated solvents | HSDB | ||
| Vapor pressure | 0.000479 mmHg | at 25 °C | HSDB |
| 10 mmHg | at 167.72 °C | CAMEO | |
| 9.9758 mmHg | at 168 °C | ICSC | |
| Lower explosive limit (LEL) | Finely dispersed particles form explosive mixtures in air. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Pyrogallol
Storage conditions
/Store/ separated from strong oxidants, strong bases.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
The solution in water is a weak acid. Reacts with oxidants and bases.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
PYROGALLIC ACID is a strong reducing agent. Reacts with alkalis, NH3, antipyrine, camphor, phenol, iron and lead salts, iodine, lime water, menthol and KMnO4. (NTP, 1992)
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Pyrogallol in the storage compatibility matrix →