Pigments & Colorants
REACH
2-naphthol
CAS Number
135-19-3
EC Number
205-182-7
What is 2-naphthol?
2-Naphthol (CAS 135-19-3), also known as Developer BN and Naphthol B, is an aromatic alcohol used as a key chemical intermediate in the synthesis of dyes, pigments, and pharmaceutical compounds.
Where is 2-naphthol used?
- Azo chemistry: coupling component
- Industrial formulations: preservative and antioxidant
- Textile and leather processing: diazo coupling base applied directly to fiber, enabling on-fiber formation of fast azo dyes with strong wash resistance
- Pigment manufacturing: azo pigment reds and lakes for printing inks and packaging coatings
- Pharmaceutical manufacturing: starting material for antifungal actives and API intermediates
- Personal care formulators have historically used it for its preservative properties.
Good to know: Antioxidant properties in specific topical applications, though regulatory acceptance varies by market.
Commercial specifications
- Packaging: 25 kg bags or drums to bulk quantities
Other Names (Synonyms)
Trimetin|Naphthol b|Developer BN|beta.-Hydroxynaphthalene|beta-Napthol|beta-Naphtol|beta-Naphthyl hydroxide|beta-Naphthyl alcohol
What are the physical properties of 2-naphthol?
Melting Point 121.6 °C
Boiling Point 285 °C
Density 1.28 g/cm³ @ Temp: 20 °C
Flash Point 153 °C
Appearance 2-Naphthol is a white, crystalline solid. Slight phenolic odor. Darkens in air and on exposure to light.
Color White
Odor faint phenol-like odor
Form Powder, Crystals or Granules
Water Solubility 1 g/L (20 ºC)
Vapor Pressure 10 mm Hg ( 145.5 °C)
Refractive Index 1.5762 (estimate)
Log P 1.89 at 20℃
How is 2-naphthol classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard GHS05· Corrosive GHS08· Health Hazard
Hazard Statements
H302 Harmful if swallowed
H317 May cause an allergic skin reaction
H318 Causes serious eye damage
H319 Causes serious eye irritation
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
Which trade and regulatory codes apply to 2-naphthol?
HS Code 29071590
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 2