Ingredient Dictionary

2,3-NAPHTHALENEDIOL

Naphthalene-2,3-diol is a naphthalenediol.

Definition

Naphthalene-2,3-diol is a naphthalenediol.

Source: PubChem

US FDA substance register · UNII O9U131030Z · registered name 2,3-NAPHTHALENEDIOL · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Dyes hairHAIR DYEING

Safety & regulatory references

Banned: Argentina · ASEAN · Brazil · China · European Union · South Korea · Taiwan · United Kingdom

Source: ASEAN Cosmetic Directive · EU Cosmetics Regulation · MFDS (Korea) cosmetic regulatory information · Taiwan FDA cosmetic ingredients · UK cosmetics regulations (OPSS)

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

EU Cosmetics Regulation, Annex II (prohibited substances), entry 1213

Source: EU prohibited substances (Annex II)

Restriction II/1213

Source: EU CosIng ingredient list

Reviewed by CIR: Final Report on the Safety Assessment of 2,3-Naphthalenediol

Source: US Cosmetic Ingredient Review (CIR)

CIR reviewed this ingredient and flagged its status as: CIR insufficient data ingredients - use not supported (insufficient data or use not supported — CIR's own classification, not a full safety-as-used conclusion).

Source: US Cosmetic Ingredient Review (CIR)

More data — names, identifiers, properties, test records, literature

Names & identifiers

2,3-NAPHTHALENEDIOLINCI2,3-나프탈렌다이올Korean label name (MFDS standard)

CAS No.chemical registry number: 92-44-4
EC No.EU chemical inventory number: 202-156-7
DTXSIDUS EPA chemical ID: DTXSID2043903
DTXCIDUS EPA compound ID: DTXCID0023903

IUPAC: Naphthalene-2,3-diol
Molecular formula: C10H8O2
Molecular weight: 160.172 g/mol

Measured properties

Appearance: White powder, [Alfa Aesar MSDS] · solid
Colour: White to off-white
Melting/freezing point: 162 ℃
Initial boiling point and range: 354 ℃
Flash point: 175 ℃
Vapour pressure: 0.00000715 ㎜Hg (25 degC)
Water solubility: 293 ㎎/ℓ (20degC)
n-Octanol/water partition coefficient (Kow): 2.24
Auto-ignition temperature: 330 ℃ (&amp, lt, )
Molecular weight: 160.18

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: PubChem · KOSHA safety data sheets (Korea)

What products actually use it for

What the 1 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

Dye1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

2 skin studies and 1 eye studies are on record.

Classed as moderate2

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 3 studies

SkinIrr2
Skin Irritation · QSAR Predicted
SkinSens1
Skin Sensitization · QSAR Predicted
Category 8.3A (Category 1)
Eye Irritation · Read Across