Description

4-Amino-3,6-Bis[[4-[(2,4-Diamino-5-Methylphenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt is a high-purity, complex azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart deep, stable colors and is a critical precursor in the synthesis of specialized dyes and pigments. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries who require consistent quality and reliable supply chains for their production processes.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-performance direct, acid, and reactive dyes, particularly for cotton and polyamide fibers.
• Textile Dyeing and Printing: Used to produce dyes that offer excellent color fastness, brightness, and wash resistance for fabrics.
• Ink Manufacturing: Employed in the formulation of inks for packaging, security printing, and specialty publications where color intensity and stability are paramount.
• Industrial Pigments: Acts as a precursor for pigments used in plastics, paints, and coatings, providing durable coloration.
• Research & Development: Utilized in chemical research for developing new chromophores and studying structure-property relationships in dye chemistry.
• Analytical Reagents: Can be used as a staining agent or indicator in specific analytical and histochemical applications.

Basic Information

Product Name	4-Amino-3,6-Bis[[4-[(2,4-Diamino-5-Methylphenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt
CAS No.	6745-67-1
Molecular Formula	C40H30N12Na2O10S2
Molecular Weight	964.84 g/mol
Synonyms	Direct Black 38 (Parent Dye); C.I. 30235; 4-Amino-5-hydroxy-3,6-bis[[4-[(2,4-diamino-5-methylphenyl)azo]phenyl]azo]-2,7-naphthalenedisulfonic acid disodium salt; Pontamine Black E; Azo Black; Benzo Black; Diamine Black; Direct Deep Black EW; Direct Black EX
EINECS	229-819-0

Quality Control

Our production of 4-Amino-3,6-Bis[[4-[(2,4-Diamino-5-Methylphenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. Comprehensive Certificates of Analysis (COA) detailing purity, impurity profiles, and physical characteristics are provided to guarantee traceability and quality assurance for your B2B applications.

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). Keep away from incompatible materials such as strong oxidizing agents. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (typical ≥ 98.0%)
Water Content (KF)	≤ 5.0%
Ash Content	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Soluble, clear solution

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