Description

5-[[1-Hydroxy-6-(Phenylamino)-3-Sulpho-2-Naphthyl]Azo]-8-[[7-Sulpho-4-[(3-Sulphophenyl)Azo]-1-Naphthyl]Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt is a high-purity, polyazo dye intermediate of significant industrial importance. This compound is valued for its ability to impart strong, complex color properties and its reactivity in synthesizing advanced dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty coatings industries seeking to produce high-performance colorants with excellent fastness properties.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton and cellulose fiber dyeing and printing.
• Production of Acid Dyes: Used in manufacturing acid dyes for wool, silk, and nylon, providing vibrant shades with good wash and light fastness.
• Specialty Pigment Synthesis: Serves as a precursor for creating complex organic pigments used in automotive paints, industrial coatings, and plastics.
• Inkjet Ink Formulations: Employed in the development of advanced colorants for high-resolution digital and textile inkjet inks.
• Functional Dyes for Non-Textile Uses: Potential applications in the synthesis of dyes for paper, leather, and as indicators or sensors in analytical chemistry.

Basic Information

Item	Details
Product Name	5-[[1-Hydroxy-6-(Phenylamino)-3-Sulpho-2-Naphthyl]Azo]-8-[[7-Sulpho-4-[(3-Sulphophenyl)Azo]-1-Naphthyl]Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt
CAS No.	72245-51-3
Molecular Formula	C42H25N6O13S4Na3 (or related sodium salt form)
Molecular Weight	Contact for details
Synonyms	C.I. Reactive Black 5 (key intermediate); Polyazo dye intermediate 72245-51-3; Sodium 5-[[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthyl]azo]-8-[[7-sulfo-4-[(3-sulfophenyl)azo]-1-naphthyl]azo]naphthalene-2-sulfonate; Reactive Black 5 precursor; Tetrasulfonated polyazo compound; Black 5 dye intermediate; Azo dye intermediate for reactive dyes
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems. Every batch undergoes comprehensive analysis to ensure consistent purity, reactivity, and color strength. We provide detailed Certificates of Analysis (COA) that include key parameters such as assay, impurity profile, and solubility, supporting your own quality assurance and R&D processes.

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). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (in Water)	Completely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Sulfated Ash	Contact for details

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