Description

6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulphophenyl)azo]-1-hydroxy-3-sulpho-2-naphthyl]azo]-2-sulphophenyl]amino]phenyl]azo]-4-hydroxynaphthalene-2-sulphonic acid, sodium salt is a high-purity, complex azo dye intermediate essential for producing deep, vibrant colors with excellent fastness properties. Its multi-sulfonated, polyazo structure provides superior solubility and binding affinity, making it a critical component for demanding technical applications. This compound is primarily sought by manufacturers in the textile, leather, and specialty ink industries who require consistent, high-performance colorants.

Application

• Textile Dyeing: A key intermediate for synthesizing high-grade, wash-fast and light-fast direct dyes and reactive dyes for cotton, wool, and nylon.
• Leather Coloring: Used in the production of dyes for leather finishing, offering deep penetration and uniform coloration.
• Ink Manufacturing: Serves as a precursor for high-performance pigments and dyes used in specialty inks for packaging and security printing.
• Paper Staining: Employed in the manufacture of dyes for high-quality paper products requiring specific color standards.
• Biological Staining: Potential use as an intermediate for developing histological stains due to its polyazo and diamine functional groups.
• Research & Development: Used as a standard or intermediate in chemical research for developing new chromophores and functional dyes.

Basic Information

Item	Details
Product Name	6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulphophenyl)azo]-1-hydroxy-3-sulpho-2-naphthyl]azo]-2-sulphophenyl]amino]phenyl]azo]-4-hydroxynaphthalene-2-sulphonic acid, sodium salt
CAS No.	85188-18-7
Molecular Formula	C44H30N14O13S4 · xNa
Molecular Weight	Contact for details
Synonyms	Direct Black 22 (sodium salt); C.I. 35435; Azo Black; Polyazo Black Dye Intermediate; Sodium 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulfophenyl)azo]-1-hydroxy-3-sulfo-2-naphthyl]azo]-2-sulfophenyl]amino]phenyl]azo]-4-hydroxy-2-naphthalenesulfonate; 2-Naphthalenesulfonic acid, 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diamino-5-sulfophenyl)azo]-1-hydroxy-3-sulfo-2-naphthyl]azo]-2-sulfophenyl]amino]phenyl]azo]-4-hydroxy-, sodium salt
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems. Every batch undergoes comprehensive analysis to ensure consistency in strength, hue, and impurity profile. We provide a detailed Certificate of Analysis (COA) with each shipment, which includes key parameters such as assay, impurity content, and solubility. Quality is verified against in-house standards developed for high-performance colorant applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect purity and performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.0 - 8.0

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