Description

4-Hydroxy-7-[[[[5-Hydroxy-6-[(2-Methyl-4-Sulphophenyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-(Phenylazo)Naphthalene-2-Sulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure provides excellent chromophoric properties, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, stable colors with specific technical characteristics.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton and other cellulosic fibers.
• Production of Acid Dyes: Used in manufacturing acid dyes for wool, silk, and nylon, offering good light and wash fastness.
• Specialty Pigment Synthesis: Serves as a precursor for creating complex organic pigments used in inks, plastics, and coatings.
• Textile Printing Inks: Employed in formulating inks for digital and screen printing on textiles, providing intense coloration.
• Laboratory & Research: Used as a standard or research chemical in analytical chemistry and dye development studies.
• Functional Dye Manufacturing: Potential use in creating dyes for specialized applications like sensors or laser materials.

Basic Information

Item	Detail
Product Name	4-Hydroxy-7-[[[[5-Hydroxy-6-[(2-Methyl-4-Sulphophenyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-(Phenylazo)Naphthalene-2-Sulphonic Acid, Sodium Salt
CAS No.	93964-40-0
Molecular Formula	C34H23N7O12S3Na (or similar, based on sodium salt form)
Molecular Weight	Contact for details
Synonyms	Acid Red 337 (related dye); Sodium 4-hydroxy-7-({[(5-hydroxy-6-[(2-methyl-4-sulfophenyl)diazenyl]-7-sulfo-2-naphthyl)carbamoyl]amino})-3-(phenyldiazenyl)naphthalene-2-sulfonate; CI 25815 (possible related index); Polyazo dye intermediate; Reactive dye intermediate K-7B (industry code); Azo dye precursor 93964-40-0; 3-(Phenylazo)-4-hydroxy-7-[[[[5-hydroxy-6-[(2-methyl-4-sulfophenyl)azo]-7-sulfo-2-naphthyl]amino]carbonyl]amino]-2-naphthalenesulfonic acid sodium salt
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and purity. Every lot is analyzed using modern techniques including HPLC and spectrophotometry to confirm identity and strength. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment to support your quality assurance and regulatory 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). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); avoid exposure to high humidity and incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark colored 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
pH (1% Solution)	6.0 - 8.0

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