Description

Pentasodium 4-hydroxy-5-[[4-[[[[5-hydroxy-7-sulphonato-6-[[2-sulphonato-4-[(4-sulphonatophenyl)azo]phenyl]azo]-2-naphthyl]amino]carbonyl]amino]-5-methoxy-o-tolyl]azo]naphthalene-2,7-disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex poly-sulphonated structure provides exceptional solubility and binding properties, making it a critical precursor for high-performance colorants. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid, wash-fast, and light-stable dyes and pigments.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-quality reactive dyes used in cotton, wool, and nylon fiber dyeing and printing.
• Production of Acid Dyes: Used in the manufacture of acid dyes for coloring silk, leather, and paper with excellent brightness and color strength.
• Specialty Ink Formulations: A crucial component in the synthesis of pigments for high-end inkjet, packaging, and security inks requiring superior color fidelity.
• Functional Colorants: Serves as a precursor for creating functional dyes used in biological staining, optical media, and liquid crystal display (LCD) color filters.
• Research & Development: Used in chemical R&D laboratories for developing novel chromophores and studying azo dye chemistry and applications.

Basic Information

Product Name	Pentasodium 4-hydroxy-5-[[4-[[[[5-hydroxy-7-sulphonato-6-[[2-sulphonato-4-[(4-sulphonatophenyl)azo]phenyl]azo]-2-naphthyl]amino]carbonyl]amino]-5-methoxy-o-tolyl]azo]naphthalene-2,7-disulphonate
CAS No.	72987-21-4
Molecular Formula	C46H26N8Na5O23S6 (Contact for exact isomer details)
Molecular Weight	~1400 g/mol (Contact for details)
Synonyms	Reactive Black 5 Intermediate; Polyazo Dye Intermediate; C.I. Reactive Black 5 precursor; Pentasodium salt of a tetrasulphonated bis-azo dye; 4-Hydroxy-3-[[4-[[4-[[6-(hydroxy-κO)-7-sulfo-1-naphthalenyl]azo-κN1]phenyl]azo-κN1]-2-methoxyphenyl]azo]-5-[[4-[[7-sulfo-8-[(4-sulfophenyl)azo]-1-naphthalenyl]carbamoyl]amino]phenyl]azo]-2,7-naphthalenedisulfonate; Azo Dye, Black 5 type; Tetrasulphonated Bis-azo Compound.
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems. Every batch is subjected to comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistent chemical composition and performance. We provide full traceability and detailed Certificates of Analysis (COA) upon request, guaranteeing the material meets your specific technical requirements for downstream synthesis.

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). Keep away from strong oxidizing agents. Due to its complex organic nature and sulphonate groups, the material is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (HPLC/IR)	Conforms to reference standard
Assay (HPLC)	Min. 90% (Contact for higher grades)
Moisture Content (KF)	Max. 5.0%
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
pH (1% Solution)	7.0 - 9.0

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