Description

2-Naphthalenesulfonic acid, 3-[(2-chloro-4-nitrophenyl) azo]-4-hydroxy-7-[[2-hydroxy-4-[[3-hydroxy-4-[[4 -[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amin o]phenyl]azo]- is a high-purity, complex azo dye intermediate essential for producing vibrant and stable colorants. This compound matters for its role in synthesizing specialized dyes with excellent light and wash fastness properties for demanding applications. Industrial manufacturers of pigments, textile dyes, and specialty inks require this precise chemical building block to achieve consistent, high-performance coloration in their final products.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a critical precursor in the synthesis of high-performance, polyazo direct and reactive dyes.
• Textile Dyeing: Used in the manufacturing of dyes for coloring cotton, wool, silk, and nylon, offering strong color yield and good fastness.
• Specialty Ink Formulation: Employed in the production of pigments for inks used in packaging, security printing, and digital textiles.
• Leather Coloring: A key component in dyes for the leather tanning and finishing industry.
• Paper Dyeing: Used in the manufacture of dyes for high-quality paper and board products.
• Research & Development: Utilized in chemical R&D for developing novel chromophores and studying dye-synthetic pathways.

Basic Information

Item	Detail
Product Name	2-Naphthalenesulfonic acid, 3-[(2-chloro-4-nitrophenyl) azo]-4-hydroxy-7-[[2-hydroxy-4-[[3-hydroxy-4-[[4 -[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amin o]phenyl]azo]-
CAS No.	72139-00-5
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Direct Brown 223; Direct Brown 223; 2-Naphthalenesulfonic acid, 7-[[4-[[4-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]amino]-3-hydroxyphenyl]azo]-2-hydroxyphenyl]azo]-3-[(2-chloro-4-nitrophenyl)azo]-4-hydroxy-; Direct Fast Brown BRL; Direct Brown BRL; Direct Brown BNL; Direct Fast Brown BNL
EINECS	Contact for details

Quality Control

Every batch of our azo dye intermediate is manufactured and tested under a strict quality management system to ensure consistent purity and performance. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, impurity profile, and strength. Our quality commitment aligns with industry standards for dye and pigment intermediates, ensuring reliability for your synthesis 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). Keep away from strong oxidizing agents and incompatible materials. The container should be kept tightly closed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Ash Content	Max. 1.0%
Water Solubility	Soluble
Heavy Metals (as Pb)	Max. 20 ppm

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