Description

6-[(2,4-Diaminophenyl)azo]-3-[[4'-[[2,4-diamino-5-[(4-sodiosulfophenyl)azo]phenyl]azo]-3'-sodiosulfo[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2-sulfonic acid sodium salt is a high-purity, complex azo dye intermediate essential for producing deep, vibrant colors with excellent fastness properties. This compound is critical for manufacturers requiring precise color formulation and consistent batch-to-batch performance in demanding applications. It is primarily utilized by the textile, leather, and specialty ink industries for dyeing and printing processes where color strength and durability are paramount.

Application

• Textile Dyeing: A key intermediate for synthesizing high-performance dyes used on cotton, wool, silk, and nylon fibers.
• Leather Finishing: Used in the production of dyes for coloring leather goods, providing rich, uniform shades with good light and rub fastness.
• Ink Manufacturing: Serves as a precursor for pigments in specialty printing inks, including inks for packaging and security applications.
• Paper Coloring: Employed in the manufacture of dyes for high-quality paper and board products.
• Research & Development: Used as a standard or building block in chemical research for developing new colorants and functional materials.

Basic Information

Product Name	6-[(2,4-Diaminophenyl)azo]-3-[[4'-[[2,4-diamino-5-[(4-sodiosulfophenyl)azo]phenyl]azo]-3'-sodiosulfo[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2-sulfonic acid sodium salt
CAS No.	6546-67-4
Molecular Formula	C40H28N12Na2O10S3
Molecular Weight	1010.88 g/mol
Synonyms	Direct Black 38 (principal commercial name); C.I. 30235; Benzo Black; Azo Black; 4-Hydroxy-3-[[4'-[[2,4-diamino-5-[(4-sulfophenyl)azo]phenyl]azo]-3'-sulfo[1,1'-biphenyl]-4-yl]azo]-6-[(2,4-diaminophenyl)azo]-2-naphthalenesulfonic acid disodium salt; Diazol Black; Pontamine Black; Chlorazol Black
EINECS	229-471-2

Quality Control

Our production of this azo dye intermediate adheres to strict quality control protocols to ensure high purity and consistent performance. Every batch is analyzed using advanced techniques like HPLC and spectrophotometry to confirm identity, strength, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing assay, heavy metal content, and other critical parameters 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, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Dark blue-black to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Ash Content	≤ 1.0%

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