Description

4-Amino-3,6-Bis[[4-[(2,4-Diamino-5-Chlorophenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt is a high-purity, complex azo dye intermediate of significant industrial importance. This compound is valued for its role in synthesizing specialized dyes and pigments that offer excellent color fastness and specific optical properties. It is primarily sought by manufacturers in the textile, ink, and specialty chemical sectors for producing high-performance colorants.

Application

• Primary Intermediate for Polyazo Dyes: Serves as a critical building block in the synthesis of deep, complex black, blue, and green polyazo dyes for textiles and leather.
• Specialty Ink Formulations: Used in the production of high-quality pigments for inks in packaging, security printing, and digital applications.
• Functional Dye Synthesis: A precursor for dyes used in non-textile applications, such as paper coloring and toners.
• Research & Development: Employed in chemical R&D for developing novel chromophores with specific light-absorption characteristics.
• Analytical Reagents: Can be utilized in the formulation of specialized stains and indicators in laboratory settings.

Basic Information

Item	Details
Product Name	4-Amino-3,6-Bis[[4-[(2,4-Diamino-5-Chlorophenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt
CAS No.	6535-59-7
Molecular Formula	C40H26Cl2N12Na2O10S2
Molecular Weight	1019.73 g/mol
Synonyms	Direct Black 38 (disodium salt); C.I. 30235; Pontamine Black E; Azo Black; 4-Amino-5-hydroxy-3,6-bis((4-((2,4-diamino-5-chlorophenyl)diazenyl)phenyl)diazenyl)naphthalene-2,7-disulfonic acid disodium salt; Benzamine Black E; Chloramine Black E; Diazol Black 2V
EINECS	229-439-8

Quality Control

Our production of this azo dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high purity. Every lot is tested using advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to support your quality assurance processes.

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 sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Solubility (Water)	Soluble, clear solution
Heavy Metals (as Pb)	≤ 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.