Overview
2-Aminophenol (CAS 95-55-6 ), also known as o-hydroxyaniline, is an aromatic amine intermediate used across dye manufacturing, pharmaceutical synthesis, and specialty chemical production.
It functions primarily as a building block for azo dyes, active pharmaceutical ingredients, and rubber antioxidants. In textile and leather dyeing, it serves as a key intermediate in the synthesis of azo and mordant dyes.
This chemical contributes to colorfast performance on natural fibers. Pharmaceutical manufacturers use it to produce benzoxazole-based APIs and other heterocyclic compounds requiring an ortho-amino-hydroxyl substitution pattern.
In personal care, it acts as an oxidative hair dye intermediate, coupling with developer agents to produce brown and auburn shades in professional and retail color formulations.
Rubber and polymer producers incorporate it into antioxidant and antiozonant compounds to extend product service life under thermal stress. It is supplied as an off-white to light tan crystalline powder.
Standard commercial grades include technical and pharmaceutical-grade material, with purity levels typically ranging from 98% to 99%+ by HPLC or titration to meet industrial requirements.
Packaging is available in multi-kilogram bags through to bulk drum quantities to suit both formulation-scale and industrial procurement volumes for global distribution and logistics.
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Physical Properties
| Melting Point | 170-174 °C |
| Boiling Point | 174 °C |
| Density | 1.328 g/cm³ @ Temp: 25 °C |
| Flash Point | 168 °C |
| Appearance | o-Aminophenol appears as colorless needles or as white crystalline substance turning tan to brown on exposure to air. |
| Color | White to brown |
| Form | Powder |
| Water Solubility | 17 g/L (20 ºC) |
| Vapor Pressure | 14 hPa (153 °C) |
| Refractive Index | 1.5444 (estimate) |
| pH | 6.5-7.5 (10g/l, H2O, 20℃) |
| Log P | 0.620 |
Safety & Handling
Warning GHS07 GHS08 GHS09 Hazard Statements H302 Harmful if swallowed H317 May cause an allergic skin reaction H332 Harmful if inhaled H341 Suspected of causing genetic defects H371 May cause damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic 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. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. 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. P333+P317 Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse.
Trade & Regulatory
| HS Code | 29222900 |
| UN Number | 2512 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 2 |
Other Names
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Chemical Properties
- CAS Number
- 95-55-6
- EC Number
- 202-431-1
- Mol. Weight
- 109.13
- HS Code
- 29222900
- Category
- Amines