Description

3-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Azo]-6-[(2,4-Diamino-5-Sulfophenyl)Azo]-4-Hydroxy-2-Naphthalenesulfonic Acid Disodium Salt is a high-purity, polyazo dye intermediate essential for producing vibrant and stable colorants. Its complex molecular structure, featuring multiple azo linkages and sulfonic acid groups, provides excellent chromophore properties and water solubility for demanding applications. This compound is a critical raw material for manufacturers in the textile, leather, paper, and specialty ink industries seeking to formulate high-performance dyes and pigments.

Application

• Primary intermediate for the synthesis of high-grade, polyazo direct dyes and acid dyes for textiles.
• Key chromophore component in the manufacturing of dyes for leather finishing and coloring.
• Used in the production of colorants for specialty papers and paper coatings.
• Essential building block for creating high-performance pigments and inks used in industrial printing.
• Acts as a precursor in the development of complex dyes for biological staining applications in histology.
• Employed in research and development for novel organic colorants and functional materials.

Basic Information

Product Name	3-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Azo]-6-[(2,4-Diamino-5-Sulfophenyl)Azo]-4-Hydroxy-2-Naphthalenesulfonic Acid Disodium Salt
CAS No.	83293-51-0
Molecular Formula	C28H22N10O7S2 · 2Na
Molecular Weight	724.70 g/mol
Synonyms	Direct Black 38 (principal synonym); C.I. 30235; Benzamine Black E; Azo Black; Diazol Black; Pontamine Black E; 3-[[4-[(2,4-Diaminophenyl)diazenyl]phenyl]diazenyl]-6-[(2,4-diamino-5-sulfophenyl)diazenyl]-4-hydroxy-2-naphthalenesulfonic acid disodium salt; Direct Black BN
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high chemical purity. Quality is verified through advanced analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with each shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

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

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