Description

Tetrasodium 4,4'-[(4,6-Dihydroxy-1,3-Phenylene)Bis(Azo)]Bis[5-Hydroxy-6-[(4-Nitrophenyl)Azo]Naphthalene-2,7-Disulphonate] is a high-purity, complex azo dye intermediate essential for producing vibrant and stable colorants. This compound matters because it provides the critical chromophore structure required for high-performance dyes with excellent light and wash fastness properties. It is primarily needed by manufacturers in the textile, leather, ink, and specialty coatings industries seeking to develop advanced, durable color products.

Application

• Primary Intermediate for Reactive Dyes: Synthesis of high-grade reactive dyes for cotton, wool, and nylon textiles.
• Leather Dyeing: Production of colorants for high-quality leather finishing with deep, even shades.
• Ink Manufacturing: Key component in formulating pigments for industrial inks, including packaging and security inks.
• Specialty Coatings: Used in the creation of colored coatings for plastics, papers, and other substrates.
• Research & Development: Serves as a standard or precursor in chemical R&D for novel dye and pigment synthesis.
• Quality Control Reference: Employed as an analytical reference standard in dye manufacturing QC laboratories.

Basic Information

Product Name	Tetrasodium 4,4'-[(4,6-Dihydroxy-1,3-Phenylene)Bis(Azo)]Bis[5-Hydroxy-6-[(4-Nitrophenyl)Azo]Naphthalene-2,7-Disulphonate]
CAS No.	83968-72-3
Molecular Formula	C44H22N10Na4O20S4
Molecular Weight	~1290.94 g/mol
Synonyms	Reactive Black 5 Tetrasodium Salt; C.I. Reactive Black 5; Remazol Black B; Lanasol Black B; Tetrasodium 4-Amino-5-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-6-(phenylazo)-2,7-naphthalenedisulfonate (related isomer); Tetrasodium 1-amino-4-[[4-[(2,4-disulfo-1-naphthalenyl)azo]phenyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonate (common azo dye core); Tetrasodium 6-Amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]-1-naphthalenyl]azo]-5-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-2,7-naphthalenedisulfonate; Azo Dye Intermediate 83968-72-3
EINECS	Contact for details

Quality Control

Our Tetrasodium 4,4'-[(4,6-Dihydroxy-1,3-Phenylene)Bis(Azo)]Bis[5-Hydroxy-6-[(4-Nitrophenyl)Azo]Naphthalene-2,7-Disulphonate] is produced under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye synthesis. Certificates of Analysis (COA) documenting purity, heavy metal content, and other critical parameters are available upon request 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 room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials such as strong oxidizing agents.

Specification

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

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