Overview
3-Hydroxy-2-naphthoic acid (CAS 92-70-6 ), commonly known as BON acid or BONA, is a naphthalene-derived organic acid used primarily as a coupling component and intermediate.
It is essential in the production of azo pigments and dyes. Its reactivity makes it a foundational building block for colorant chemistry across printing, textile, and coatings industries.
In pigment manufacturing, BONA is reacted with diazonium salts to produce BON arylamide pigments. These include Pigment Red 48 and related lake pigments used in packaging inks and plastics.
These pigments are favored in coatings where heat stability and color strength are critical. Textile and leather processors use BONA-derived azo dyes for dyeing synthetic and natural fibers.
Consistent shade reproducibility across batch production is a key requirement for these applications. In pharmaceutical synthesis, it functions as an intermediate in the preparation of active compounds.
It is used for specialty chemicals requiring a hydroxylated naphthoic acid scaffold. Personal care formulators also source it for UV-stabilizing additive development in select cosmetic applications.
3-Hydroxy-2-naphthoic acid is supplied as an off-white to light tan crystalline powder. Technical and pharmaceutical-grade material is available with high purity specifications.
Purity typically ranges from 98% to 99%+ by HPLC. Packaging is offered in kilogram quantities through to bulk industrial supply to meet diverse manufacturing requirements.
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Physical Properties
| Melting Point | 222-223 °C |
| Boiling Point | 283.17°C (rough estimate) |
| Density | 1.43 g/cm3 (23℃) |
| Flash Point | >150°C |
| Appearance | yellow to beige-brown fine crystalline powder |
| Color | Yellow to beige-brown |
| Form | Fine Crystalline Powder |
| Water Solubility | PRACTICALLY INSOLUBLE |
| Refractive Index | 1.7160 (estimate) |
Safety & Handling
Danger GHS05 GHS07 GHS08 Hazard Statements H302 Harmful if swallowed H312 Harmful in contact with skin H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H319 Causes serious eye irritation H335 May cause respiratory irritation H361 Suspected of damaging fertility or the unborn child H371 May cause damage to organs H373 May causes damage to organs through prolonged or repeated exposure H402 Harmful to aquatic life H412 Harmful to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. 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. 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. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. 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. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. 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 | 29182910 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 1 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 92-70-6
- EC Number
- 202-180-8
- Mol. Weight
- 188.18
- HS Code
- 29182910
- Category
- Pharmaceutical Intermediates