Description

Disodium 4-Amino-3,6-Bis[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its core value lies in its role as a critical precursor for synthesizing high-performance, complex dyes and pigments, particularly in applications demanding specific color fastness and stability. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to develop advanced coloring agents. Its consistent quality and reliable supply chain are paramount for ensuring batch-to-batch reproducibility in final product formulations.

Application

• Primary Intermediate for Dyes & Pigments: Serves as a key building block in the synthesis of high-value direct, reactive, and acid dyes, especially for dark shades like blacks, navies, and browns.
• Textile Dyeing: Used in the production of dyes for coloring natural and synthetic fibers such as cotton, wool, silk, and nylon, where good wash and light fastness are required.
• Leather Finishing: Employed in manufacturing dyes for the leather industry, providing deep, uniform coloration for finished leather goods.
• Specialty Inks: Acts as an intermediate for pigments used in high-performance inks for packaging, security printing, and other industrial applications.
• Research & Development: Utilized in chemical R&D laboratories for developing novel chromophores and studying azo dye chemistry and properties.
• Functional Dyes: Potential use as a precursor for dyes with specialized functions, such as those used in optical data storage or as sensitizers.

Basic Information

Product Name	Disodium 4-Amino-3,6-Bis[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonate
CAS No.	72906-46-8
Molecular Formula	C28H20N8Na2O10S2
Molecular Weight	730.67 g/mol
Synonyms	Direct Black 22 Intermediate; 4-Amino-3,6-bis[(4-aminophenyl)azo]-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt; C.I. 35435; Azoic Diazo Component 48; Disodium 4-amino-5-hydroxy-3,6-bis[(4-aminophenyl)azo]naphthalene-2,7-disulphonate; 2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis[(4-aminophenyl)azo]-5-hydroxy-, disodium salt
EINECS	Contact for details

Quality Control

Our production of Disodium 4-Amino-3,6-Bis[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonate adheres to stringent quality management protocols to ensure product consistency and reliability for industrial synthesis. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via FT-IR and UV-Vis spectroscopy. We provide detailed Certificates of Analysis (COA) with each shipment, documenting key parameters such as assay, impurity profile, and solubility. Our quality system is designed to meet the exacting standards of global chemical manufacturing and dye production.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Keep away from strong oxidizing agents and incompatible materials. The container should be kept tightly sealed when not in use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 95.0% (typical 97-99%)
Solubility (in Water)	Freely soluble
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.