Description

4-Amino-3,6-Bis[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonic Acid is a high-purity, complex azo dye intermediate of significant commercial importance. Its value lies in its role as a critical precursor for synthesizing high-performance dyes and pigments, particularly those requiring specific color fastness and stability. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant and durable colorants.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-grade, polyazo direct dyes and acid dyes for textiles like cotton, wool, and nylon.
• Pigment Manufacturing: Used in the production of organic pigments for inks, plastics, and coatings, where its disulphonic acid groups enhance solubility and application properties.
• Specialty Colorants: Employed in the development of specialized dyes for leather, paper, and food colorants (where specific purity grades are met).
• Research & Development: A valuable compound for chemical R&D in organic synthesis and for studying the properties of polyfunctional azo compounds.
• Functional Dyes: Potential use in the synthesis of dyes for non-textile applications, such as in lasers or as pH indicators, due to its multiple amino and azo groups.

Basic Information

Product Name	4-Amino-3,6-Bis[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonic Acid
CAS No.	56405-32-4
Molecular Formula	C28H22N8O8S2
Molecular Weight	662.66 g/mol
Synonyms	Acid Black 210; C.I. 28440; 4-Amino-3,6-bis[(4-aminophenyl)diazenyl]-5-hydroxynaphthalene-2,7-disulfonic acid; 5-Hydroxy-4-amino-3,6-bis(p-amino phenylazo)-2,7-naphthalenedisulfonic acid; 2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis[(4-aminophenyl)azo]-5-hydroxy-; Azo dye intermediate 56405-32-4
EINECS	Contact for details

Quality Control

Our production of 4-Amino-3,6-Bis[(4-Aminophenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical data is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark Brown to Black Powder or Crystals
Identification (IR)	Conforms to Structure
Assay (HPLC)	≥ 95.0% (Typical 97-99%)
Loss on Drying	≤ 2.0 %
Sulfated Ash	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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