Industrial Purity Specs For 4-Amino-3-Nitrophenol
- Critical Specifications: Target assay ≥99.0% with strict control on heavy metals and residual solvents for cosmetic compliance.
- Physical Properties: Deep violet crystalline powder with a melting point range of 150-154 °C, requiring inert storage.
- Procurement Focus: Prioritize suppliers offering full COA documentation and scalable bulk price structures for industrial manufacturing.
In the realm of fine chemical synthesis and cosmetic formulation, the quality of raw intermediates dictates the efficiency and safety of the final product. 4-Amino-3-nitrophenol (CAS: 610-81-1) is a critical building block primarily utilized in oxidative hair dye systems and pharmaceutical intermediates. For procurement managers and process chemists, understanding the nuanced industrial purity specifications is essential to maintain consistent reaction yields and regulatory compliance. This compound, also known synonymously as 3-Nitro-4-aminophenol, requires rigorous quality control due to its hygroscopic nature and sensitivity to light.
Key Physicochemical Parameters for Quality Control
When establishing incoming quality control (IQC) protocols for bulk shipments, technical teams must verify specific physical constants against the certificate of analysis. Deviations in melting point or appearance often indicate the presence of isomeric impurities or incomplete nitration during the synthesis route. The following table outlines the standard technical specifications expected for industrial-grade material.
| Parameter | Standard Specification | Test Method |
|---|---|---|
| CAS Number | 610-81-1 | N/A |
| Molecular Formula | C6H6N2O3 | N/A |
| Molecular Weight | 154.12 g/mol | N/A |
| Appearance | Deep Violet to Dark Red Crystalline Powder | Visual |
| Assay (Purity) | >98.0% (HPLC) | High-Performance Liquid Chromatography |
| Melting Point | 150-154 °C | Capillary Method |
| Water Content | <0.5% | Karl Fischer Titration |
| Heavy Metals | <10 ppm | ICP-MS |
Maintaining a melting point within the 150-154 °C range is a primary indicator of chemical identity. A depressed melting point often suggests the presence of unreacted starting materials or oxidation byproducts. Furthermore, because this substance is hygroscopic, water content must be tightly monitored to prevent clumping and degradation during storage. A reliable COA from the manufacturer should explicitly detail these metrics alongside batch-specific data.
Implications of Purity in Hair Dye and Pharmaceutical Synthesis
The application of this intermediate in oxidative hair dyeing requires exceptional purity to minimize skin sensitization risks. Impurities such as residual nitro-compounds or isomeric aminophenols can alter the colorimetric profile of the dye and increase the potential for allergic reactions. In pharmaceutical contexts, where this chemical serves as a precursor for benzimidazole-based inhibitors, strict control over organic impurities is vital to meet ICH guidelines.
Process chemists must evaluate the manufacturing process employed by their supplier. Traditional nitration routes can produce various isomers, necessitating advanced purification steps such as recrystallization or column chromatography to achieve >99% purity. Lower purity grades may be suitable for research use, but industrial scale-up demands consistency to avoid batch failures in downstream processing. When sourcing high-purity 4-Amino-3-nitrophenol, buyers should request sample batches for pilot testing before committing to large volumes.
Storage, Stability, and Safety Handling
Proper storage is critical to maintaining the integrity of the chemical over time. The material should be kept in a dark place under an inert atmosphere at room temperature to prevent oxidation and photodegradation. Given its classification under GHS07 with warning signals for skin and eye irritation, appropriate personal protective equipment (PPE) including dust masks, eyeshields, and gloves is mandatory during handling.
Stability data indicates that the compound is sensitive to light and moisture. Bulk packaging should therefore utilize moisture-barrier liners within fiber drums or sealed steel drums. For large-scale operations, inventory turnover should be managed to prevent long-term storage issues that could compromise the industrial purity of the stock.
Commercial Considerations and Bulk Procurement
Procurement strategies for fine chemical intermediates must balance cost with quality assurance. While bulk price is a significant factor, the total cost of ownership includes the risk of production delays caused by substandard raw materials. A global manufacturer with established quality management systems can provide consistent supply chains and technical support.
NINGBO INNO PHARMCHEM CO.,LTD. stands as a premier partner for sourcing this critical intermediate, offering scalable production capacities and rigorous quality testing protocols. By partnering with a dedicated manufacturer like NINGBO INNO PHARMCHEM CO.,LTD., companies can secure reliable supply chains that adhere to international safety and purity standards. This ensures that downstream products, whether cosmetic or pharmaceutical, meet regulatory requirements without compromise.
Conclusion
In summary, the successful integration of 4-Amino-3-nitrophenol into industrial applications hinges on strict adherence to purity specifications, proper storage conditions, and reliable supply chain partnerships. Technical teams should prioritize suppliers who provide transparent documentation and consistent quality. By focusing on these core parameters, manufacturers can optimize reaction yields and ensure the safety and efficacy of their final products.