Description

N-[5-[[2-Hydroxy-3,6-bis(sodiosulfo)-1-naphthalenyl]azo]-2-[[4'-[[2-hydroxy-3,6-bis(sodiosulfo)-1-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]phenyl]oxamidic acid sodium salt is a high-purity, water-soluble disazo dye intermediate with a complex molecular structure designed for demanding applications. Its primary value lies in its ability to impart strong, stable coloration and act as a key building block in the synthesis of specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking consistent performance and batch-to-batch reliability for their high-value colorant products.

Application

• Textile Dyeing: A critical intermediate for the synthesis of high-grade direct dyes and reactive dyes used on cotton, viscose, and other cellulosic fibers.
• Ink Manufacturing: Used in the production of pigments for specialty printing inks, including packaging and security inks, where color fastness is paramount.
• Functional Dye Synthesis: Serves as a precursor for dyes used in laser applications, optical data storage, and other high-tech functional materials.
• Leather Coloring: Employed in the formulation of dyes for leather finishing, providing deep, uniform shades.
• Paper Coloring: Used in the manufacture of dyes for high-quality paper and board products.
• Research & Development: A valuable chemical for R&D laboratories developing new chromophores and studying azo dye chemistry.

Basic Information

Product Name	N-[5-[[2-Hydroxy-3,6-bis(sodiosulfo)-1-naphthalenyl]azo]-2-[[4'-[[2-hydroxy-3,6-bis(sodiosulfo)-1-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]phenyl]oxamidic acid sodium salt
CAS No.	6837-83-8
Molecular Formula	C52H32N8Na6O20S4
Molecular Weight	~1390.0 g/mol (Contact for exact details)
Synonyms	Direct Black 22; C.I. 35435; Pontamine Black EBN; Benzamin Black EBN; Azo Black EBN; Disazo Black 22; Sodium 5,5'-[[3,3'-dimethyl[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[2-[[2-hydroxy-3,6-disulfo-1-naphthalenyl]azo]benzoate]]; Oxamic Acid Black Dye Intermediate
EINECS	229-923-7

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure purity and consistency for industrial synthesis. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting key parameters such as assay, impurity profile, and solubility. We support compliance with global regulatory frameworks, including REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue-black to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Solubility	Freely soluble
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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