Substance profile
1-Naphthol
1-Naphthol is yellow monoclinic needles from water with a phenolic odor.
01 · Identification
What 1-Naphthol is
1-Naphthol is yellow monoclinic needles from water with a phenolic odor. Its molecular formula is C10H8O and its molecular weight is 144.17 g/mol. It boils at 288 °C, melts at 96 °C.
Under the GHS it carries the signal word Danger.
Other names for 1-Naphthol
- 1-naphtol
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 |
|---|---|
| H312 | Harmful in contact with skin. |
| H302 | Harmful if swallowed. |
| H335 | May cause respiratory irritation. |
| H315 | Causes skin irritation. |
| H318 | Causes serious eye damage. |
Precautionary statements: P264, P270, P280, P301, P302, P305, P310, P312, P313, P330, P332, P338, P352
03 · Physical and chemical properties
1-Naphthol 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 | 288 °C (550.4 °F) | HSDB | |
| 282.5 °C (540.5 °F) | at 760 mmHg | DOE PAC | |
| 279.5 °C (535.1 °F) | range, midpoint shown, at 760 mmHg | HMDB | |
| Melting point | 96 °C (204.8 °F) | HSDB | |
| 94.5 °C (202.1 °F) | range, midpoint shown, at 760 mmHg | HMDB | |
| Density | 1.0954 g/cm³ | at 98.7 °C | HSDB |
| 1.0989 g/cm³ | at 99 °C | DOE PAC | |
| Solubility | Very soluble in ethanol and ether, soluble in acetone | HSDB | |
| Freely soluble in benzene, chloroform and alkali hydroxide solutions | HSDB | ||
| In water, 866 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 1.7 mmHg | at 110 °C, extrapolated to solid-phase | HSDB |
| 1.7 mmHg | at 100 °C | DOE PAC | |
| 0.000274 mmHg | Haz-Map | ||
| Flash point | 153 °C (307.4 °F) | open cup | HSDB |
| Autoignition temperature | 541.7 °C (1007.1 °F) | HSDB | |
| Odor threshold | Recognition: 0.0030-0.0052 mg/cu m | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling 1-Naphthol
Storage conditions
Keep in dark places.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check 1-Naphthol in the storage compatibility matrix →