Description

5-[[2-amino-4-hydroxy-5-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-3-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]naphthalene-2,7-disulphonic acid is a high-purity, complex azo dye intermediate essential for producing vivid and durable colorants. This compound matters for its role in synthesizing specialized dyes with excellent lightfastness and washfastness properties, meeting stringent industrial quality demands. It is primarily needed by manufacturers in the textile, ink, and specialty pigment industries seeking reliable, high-performance raw materials for their formulations.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton and other cellulosic fibers.
• Specialty Pigment Manufacturing: Used in the production of complex organic pigments for applications requiring high color strength and stability.
• Textile Printing Inks: Serves as a crucial component in formulating inks for digital and screen printing on textiles.
• Leather Dyeing: Employed in the manufacture of dyes for achieving deep, uniform shades on leather goods.
• Paper Coloring: Used in the production of dyes for high-grade paper and packaging materials.
• Research & Development: A valuable compound for R&D laboratories developing new chromophores and studying azo dye chemistry.

Basic Information

Product Name	5-[[2-amino-4-hydroxy-5-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-3-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]naphthalene-2,7-disulphonic acid
CAS No.	94021-34-8
Molecular Formula	C₄₀H₂₈N₁₂O₁₈S₄
Molecular Weight	1117.00 g/mol
Synonyms	Reactive Black 5 Intermediate; C.I. Reactive Black 5 precursor; Tetrasulfonated Azo Dye Intermediate; 5-[[2-Amino-4-hydroxy-5-[(4-[(4-nitro-2-sulfophenyl)amino]phenyl)azo]phenyl]azo]-4-hydroxy-3-[(4-[(4-nitro-2-sulfophenyl)amino]phenyl)azo]naphthalene-2,7-disulfonic acid; Azo Dye CAS 94021-34-8; Black 5 Dye Intermediate; Sulfonated Polyazo Compound
EINECS	Contact for details

Quality Control

Our 5-[[2-amino-4-hydroxy-5-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-3-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]naphthalene-2,7-disulphonic acid is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistent chromophore strength, and compliance with industry specifications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical characteristics are available upon request to support your quality assurance protocols.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Partially soluble

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