Description

4-Amino-3-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Azo]-6-[[4-[(2,4-Diaminophenyl)Azo]-2-Methylphenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt is a high-purity, polyazo dye intermediate of significant commercial importance. This compound is valued for its ability to impart deep, complex shades and its role in synthesizing high-performance colorants. It is primarily needed by manufacturers in the textile, leather, and specialty ink industries for producing durable black and dark-colored dyes.

Application

• Textile Dyeing: A key intermediate for the synthesis of high-quality, wash-fast black and navy direct dyes and reactive dyes for cotton, wool, and nylon.
• Leather Finishing: Used in the production of dyes for imparting deep, uniform color to leather goods with good lightfastness.
• Ink Manufacturing: Serves as a precursor for pigments and dyes used in specialty inks, including inks for packaging and security printing.
• Paper Coloring: Employed in the manufacture of dyes for coloring paper products where deep shades are required.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo dye chemistry and properties.
• Polymer Staining: Can be used to develop colorants for plastics and synthetic fibers.

Basic Information

Product Name	4-Amino-3-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Azo]-6-[[4-[(2,4-Diaminophenyl)Azo]-2-Methylphenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulfonic Acid Disodium Salt
CAS No.	6473-11-6
Molecular Formula	C39H30N12Na2O8S2
Molecular Weight	928.83 g/mol
Synonyms	Direct Black 38 (disodium salt); C.I. 30235; Benzamine Black E; Direct Deep Black EW; Direct Black EX; 2,7-Naphthalenedisulfonic acid, 4-amino-3-((4-((2,4-diaminophenyl)azo)phenyl)azo)-6-((4-((2,4-diaminophenyl)azo)-2-methylphenyl)azo)-5-hydroxy-, disodium salt
EINECS	229-296-0

Quality Control

Our production of this dye intermediate adheres to rigorous quality control protocols to ensure batch-to-batch consistency and high purity. Quality is verified through 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 tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Water Solubility	Conforms
Heavy Metals (as Pb)	≤ 20 ppm

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