Description

2,7-Naphthalenedisulfonic Acid, 4-Amino-3,6-Bis((4-((2,4-Diamino-5-Sul Fophenyl)Azo)Phenyl)Azo)-5-Hydroxy- is a complex, high-value azo dye intermediate characterized by its multi-sulfonated and poly-azo structure, which imparts excellent water solubility and chromophoric properties. This compound matters for its role as a critical precursor in the synthesis of specialized, high-performance dyes and pigments, particularly those requiring deep, vibrant colors with enhanced fastness and stability. Industrial users in the textile dyeing, leather finishing, ink formulation, and specialty chemical synthesis sectors rely on this intermediate for producing advanced colorants.

Application

• Primary Intermediate for Polyazo Dyes: Serves as a key building block in the manufacture of direct, acid, and reactive dyes, especially for cotton, wool, and nylon.
• Textile Industry: Used in the production of dyes for achieving deep, complex shades like blacks, navies, and dark browns with good wash and light fastness.
• Leather Coloring: Employed in the synthesis of dyes for leather finishing, providing rich, penetrating color.
• Ink Manufacturing: A component in the creation of specialized inks, including those for packaging and security printing applications.
• Paper Dyeing: Used in the production of dyes for coloring paper products.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo dye chemistry and properties.

Basic Information

Product Name	2,7-Naphthalenedisulfonic Acid, 4-Amino-3,6-Bis((4-((2,4-Diamino-5-Sul Fophenyl)Azo)Phenyl)Azo)-5-Hydroxy-
CAS No.	73944-13-5
Molecular Formula	C34H24N12O11S4
Molecular Weight	928.87 g/mol
Synonyms	4-Amino-3,6-bis[[4-[(2,4-diamino-5-sulfophenyl)azo]phenyl]azo]-5-hydroxy-2,7-naphthalenedisulfonic acid; C.I. Direct Black 166; Direct Black 166; Azo Black 166; Tetrakisazo Dye Intermediate; Acid Black 166 (related class); Polyazo Naphthalene Derivative
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and performance. Quality is verified through comprehensive analytical testing including HPLC for purity, spectrophotometry for color strength, and elemental analysis. A detailed Certificate of Analysis (COA) documenting identity, purity, and impurity profile is provided with every shipment to support your quality assurance and regulatory needs.

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 performance and handling.

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%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Sulfated Ash	Max. 0.5%

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