Substance profile
2-Naphthol
2-Naphthol is white, lustrious, bulky leaflets or white powder with a faint phenol-like odor.
01 · Identification
What 2-Naphthol is
2-Naphthol is white, lustrious, bulky leaflets or white powder with a faint phenol-like odor. Its molecular formula is C10H8O and its molecular weight is 144.17 g/mol. It boils at 285 °C, melts at 122 °C.
Under the GHS it carries the signal word Warning.
02 · Identifiers
2-Naphthol identifiers and molecular data
2-Naphthol CAS number and EC number
2-Naphthol molecular formula and molecular weight
03 · GHS classification
2-Naphthol hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
2-Naphthol pictograms and signal word
2-Naphthol hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 4 | H302 | GHS07 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 4 | H332 | GHS07 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
2-Naphthol hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H332 | Harmful if inhaled. |
| H302 | Harmful if swallowed. |
| H400 | Very toxic to aquatic life. |
This page lists only the codes assigned to 2-Naphthol. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for 2-Naphthol
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of 2-Naphthol issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
2-Naphthol precautionary statements
CLP Annex VI assigns 10 precautionary statements to 2-Naphthol. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
2-Naphthol name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | 2-нафтол |
| Spanish español | 2-Naftol |
| Czech čeština | 2-naftol |
| Danish dansk | 2-naphthol |
| German Deutsch | 2-Naphthol β-Naphthol |
| Estonian eesti | 2-naftool |
| Greek ελληνικά | 2-ναφθόλη |
| English English | 2-naphthol |
| French français | 2-naphtol |
| Croatian hrvatski | 2-naftol |
| Italian italiano | 2-naftolo |
| Latvian latviešu | 2-naftols |
| Lithuanian lietuvių | 2-naftolis |
| Hungarian magyar | 2-naftol |
| Maltese Malti | 2-naftol |
| Dutch Nederlands | 2-naftol |
| Polish polski | 2-naftol 2-hydroksynaftalen |
| Portuguese português | 2-naftol |
| Romanian română | 2-naftol |
| Slovak slovenčina | 2-naftol |
| Slovenian slovenščina | 2-naftol |
| Finnish suomi | 2-naftoli |
| Swedish svenska | 2-naftol |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
2-Naphthol GHS label elements
Everything CLP Annex VI fixes for 2-Naphthol, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
2-Naphthol
- Harmful if inhaled.
- Harmful if swallowed.
- Very toxic to aquatic life.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Do not eat, drink or smoke when using this product.
- Use only outdoors or in a well-ventilated area.
- Avoid release to the environment.
- IF SWALLOWED:
- IF INHALED:
- Call a POISON CENTER/doctor/… if you feel unwell.
- Rinse mouth.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open 2-Naphthol in the GHS label constructor →
07 · Health hazards
2-Naphthol health hazards and exposure limits
2-Naphthol hazard summary
A severe eye irritant; May cause skin sensitization; The substance may have effects on the kidneys, blood and eyes, resulting in kidney impairment, anaemia and lens opacities. [ICSC] Emergency medical treatment: see Phenol. [HSDB] An irritant; May cause injury to eyes; May be absorbed through skin resulting in kidney injury; [MSDSonline]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
2-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.
2-Naphthol boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 285 °C (545 °F) | HSDB | |
| 286 °C (546.8 °F) | at 760 mmHg | DOE PAC |
2-Naphthol melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 121.6 °C (250.9 °F) | HSDB | |
| 122 °C (251.6 °F) | ICSC | ||
| 123 °C (253.4 °F) | HMDB |
2-Naphthol density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.28 g/cm³ | ICSC | |
| 1.28 g/cm³ | at 20 °C | HSDB | |
| 0.581 g/cm³ | at 0 °C | DOE PAC |
2-Naphthol solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Soluble in alcohol, ether, chloroform, glycerol, oils, alkaline solutions | HSDB | |
| Very soluble in ethanol, ethyl ether; soluble in benzene, chloroform; slightly soluble in ligroin | HSDB | ||
| In water, 7.55X10+2 mg/L at 25 °C | at 25 °C | HSDB |
2-Naphthol vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.0029 mmHg | at 25 °C | HSDB |
| 0.00032 mmHg | at 25 °C | HSDB | |
| 0.015 mmHg | at 25 °C | ICSC |
2-Naphthol flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | 153 °C (307.4 °F) | HSDB | |
| 152.78 °C (307 °F) | HSDB |
2-Naphthol autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | 550 °C (1022 °F) | ICSC |
2-Naphthol vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 5 (air = 1) | ICSC |
2-Naphthol odor threshold
| Property | Value | Conditions | Source |
|---|---|---|---|
| Odor threshold | 0.01 ppm - 11.4 ppm | HSDB | |
| Odor Threshold Low: 0.01 [ppm] | Haz-Map | ||
| Odor Threshold High: 11.4 [ppm] | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
2-Naphthol fire and explosion behaviour
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.
2-Naphthol fire potential
Flammability potential is slight.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
2-Naphthol storage and handling
2-Naphthol safe storage
Store in an area without drain or sewer access.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
2-Naphthol storage conditions
Conditions for safe storage, including any incompatibilities: Keep container tightly closed in a dry and well-ventilated place. Light sensitive.
Source: Hazardous Substances Data Bank (HSDB)
2-Naphthol incompatible materials
Incompatible with antipyrine, camphor, phenol, ferric salts, menthol, potassium permanganate and other oxidizing materials, urethane.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check 2-Naphthol in the storage compatibility matrix →
11 · Questions
2-Naphthol — frequently asked questions
What is the CAS number of 2-Naphthol?
The CAS number of 2-Naphthol is 135-19-3. Its EC number is 205-182-7.
What is the chemical formula of 2-Naphthol?
The molecular formula of 2-Naphthol is C10H8O and its molecular weight is 144.17 g/mol.
What does a 2-Naphthol label have to show?
Under CLP Annex VI the label for 2-Naphthol carries the pictograms Exclamation mark and Environment and the signal word is Warning.
Is 2-Naphthol flammable?
CLP Annex VI assigns 2-Naphthol no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it. The flash point reported for it is 153 °C (307.4 °F) (HSDB).
Is 2-Naphthol a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for 2-Naphthol. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of 2-Naphthol?
The boiling point reported for 2-Naphthol is 285 °C (545 °F) (HSDB).
What is the melting point of 2-Naphthol?
The melting point reported for 2-Naphthol is 121.6 °C (250.9 °F) (HSDB).
How should 2-Naphthol be stored?
Conditions for safe storage, including any incompatibilities: Keep container tightly closed in a dry and well-ventilated place. Light sensitive. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to 2-Naphthol
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