Overview
1-Naphthol (CAS 90-15-3 ), also sold under the dye intermediate designations Zoba ERN, Ursol ERN, and Tertral ERN, is a hydroxylated naphthalene compound used primarily as a chemical intermediate.
It is used in the synthesis of dyes, pigments, and active pharmaceutical ingredients. Its reactivity toward coupling and oxidative reactions makes it a reliable building block across colorant manufacturing and specialty chemical production.
In textile and leather dyeing, it functions as a coupling component in the production of azo dyes. It reacts with diazonium salts to generate deep, fast colors on fiber substrates for various industrial applications.
Pigment manufacturers use it as a key intermediate for producing naphthol-based pigments found in printing inks and packaging coatings. In pharmaceutical synthesis, it serves as a precursor to active ingredients.
It is also utilized as an antioxidant stabilizer used in drug formulations. Personal care formulators source it for oxidative hair dye systems, where controlled coupling reactions produce specific target shades.
The product is supplied as a white to pale yellow crystalline solid or flake. Technical grade is the standard commercial form, with purity typically at 98% or higher for most industrial manufacturing processes.
Pharmaceutical-grade material meeting USP or BP specifications is available for regulated synthesis applications. This ensures high quality and compliance for sensitive chemical and medical production needs.
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Physical Properties
| Melting Point | 96 °C |
| Boiling Point | 288 °C |
| Density | 1.0954 g/cm³ @ Temp: 98.7 °C |
| Flash Point | 125 °C |
| Appearance | Pale grey to brown solid |
| Color | white to off-white |
| Odor | Slight phenolic odor |
| Form | Crystalline Flakes |
| Water Solubility | 436.7mg/L(25 ºC) |
| Vapor Pressure | 1 mm Hg ( 94 °C) |
| Refractive Index | 1.6224 |
| Log P | 2.84 at 25℃ |
Safety & Handling
Danger GHS05 GHS07 GHS06 GHS09 GHS08 Hazard Statements H302 Harmful if swallowed H311 Toxic in contact with skin H312 Harmful in contact with skin H314 Causes severe skin burns and eye damage H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H335 May cause respiratory irritation H371 May cause damage to organs H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects H411 Toxic to aquatic life with long lasting effects H412 Harmful to aquatic life with long lasting effects Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P363 Wash contaminated clothing before reuse. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29071510 |
| UN Number | 2811 |
| ADR Class | 6.1 |
| Packing Group | III |
| WGK (Germany) | 1 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 90-15-3
- EC Number
- 201-969-4
- Mol. Weight
- 144.17
- HS Code
- 29071510
- Category
- Pharmaceutical Intermediates