Description

2,7-Naphthalenedisulfonic acid, 5-[(2-amino-4-hydroxyphenyl)azo]-3-[[4'-[[7-[(2-amino-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, sodium salt is a high-purity, complex azo dye intermediate essential for producing vibrant and stable colorants. Its multi-azo and sulfonic acid structure provides excellent water solubility and strong substantivity to various substrates. This compound is a critical raw material for manufacturers of specialized dyes and pigments targeting the textile, leather, and ink industries, where consistent color strength and fastness properties are paramount.

Application

• Textile Dyeing: Primary application as a key intermediate in the synthesis of high-performance direct, acid, and reactive dyes for cotton, wool, silk, and nylon.
• Leather Coloring: Used in the formulation of dyes for leather goods, providing deep, uniform shades with good light and rub fastness.
• Ink Manufacturing: Serves as a precursor for pigments and dyes used in specialty inks for packaging, security printing, and digital applications.
• Paper Dyeing: Employed in the production of dyes for coloring paper and paperboard, offering good affinity for cellulose fibers.
• Research & Development: Utilized in chemical research for developing new chromophores and studying structure-property relationships in dye chemistry.
• Specialty Pigments: Acts as a building block for creating complex, high-value organic pigments with specific hue and performance characteristics.

Basic Information

Item	Details
Product Name	2,7-Naphthalenedisulfonic acid, 5-[(2-amino-4-hydroxyphenyl)azo]-3-[[4'-[[7-[(2-amino-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, sodium salt
CAS No.	57167-02-9
Molecular Formula	C44H32N10O14S4 · xNa
Molecular Weight	Contact for details
Synonyms	Direct Black 22 (Parent Dye); C.I. 35435; Azo Black; Sodium 5-[(2-amino-4-hydroxyphenyl)azo]-3-[[4'-[[7-[(2-amino-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-3,3'-dimethylbiphenyl-4-yl]azo]-4-hydroxy-2,7-naphthalenedisulfonate; Bisazo dye intermediate; Tetrakisazo compound; 57167-02-9; Light-sensitive azo dye intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency in purity, color value, and impurity profile. Quality is verified through advanced analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. Certificates of Analysis (COA) detailing assay, identity, and specific impurity limits are provided with every shipment to support your quality assurance systems.

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 nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect purity and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (in Water)	Completely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Related Substances (HPLC)	Individual impurity: Max. 1.0% Total impurities: Max. 5.0%

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