Description

7-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-disulfo[1,1'-biphenyl]2 。 4-Amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-disulfo(1,1'-biphenyl)-4-yl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid 。 2,7-naphthalenedisulfonic acid, 4-amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-di is a high-purity, polyazo dye intermediate characterized by its complex, multi-sulfonated structure, which is essential for producing intense and wash-fast colorants. This compound matters for manufacturers requiring exceptional color strength, thermal stability, and solubility in aqueous systems for demanding technical applications. It is primarily needed by industrial-scale producers of textile dyes, leather dyes, and specialty inks who rely on consistent, high-quality intermediates to ensure batch-to-batch reproducibility in their final products.

Application

• Primary Intermediate for Black and Navy Blue Dyes: A key building block in the synthesis of high-quality, polyazo direct and reactive dyes for cotton, viscose, and other cellulosic fibers.
• Leather Coloring Agent: Used in the formulation of dyes for leather finishing, providing deep, penetrating shades with good fastness properties.
• Specialty Ink Production: Serves as a colorant precursor in the manufacture of inks for jet printing, packaging, and other industrial marking applications.
• Paper Dyeing: Employed in the production of dyes for coloring paper and paperboard, offering good affinity and brightness.
• Research & Development: Used in chemical R&D laboratories for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Quality Control Reference Standard: Acts as a high-purity analytical standard for quality assurance and method validation in dye manufacturing facilities.

Basic Information

Item	Detail
Product Name	7-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-disulfo[1,1'-biphenyl]2 。 4-Amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-disulfo(1,1'-biphenyl)-4-yl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid 。 2,7-naphthalenedisulfonic acid, 4-amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-di
CAS No.	41601-42-7
Molecular Formula	C40H28N10O16S4
Molecular Weight	~1049.0 g/mol (Contact for exact details)
Synonyms	Direct Black 22 Intermediate; C.I. 35435 Intermediate; 4-Amino-3-{[4'-[(2,4-diaminophenyl)diazenyl]-[1,1'-biphenyl]-2,2'-disulfonato-4-yl]diazenyl}-5-hydroxy-6-(phenyldiazenyl)naphthalene-2,7-disulfonic acid; Polyazo Dye Intermediate 41601-42-7; Tetrasulfonated Azo Dye Precursor; [1,1'-Biphenyl]-2,2'-disulfonic acid, 4'-[(2,4-diaminophenyl)azo]-4-amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-disulfo[1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)-; CAS 41601-42-7
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems to ensure chemical identity, purity, and performance consistency. Every batch is analyzed using advanced techniques including HPLC, UV-Vis spectroscopy, and elemental analysis to confirm it meets precise customer specifications. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical characteristics is provided with each shipment, supporting your own quality assurance and regulatory compliance needs.

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 handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95% (Typical 97-99%)
Moisture Content (KF)	Max. 5.0%
Ash Content	Max. 1.0%
Solubility (in Water)	Freely soluble, clear solution
Heavy Metals (as Pb)	Max. 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.