Description

3-Hydroxy-4-[(4-Methyl-2-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate. This compound is valued for its role in synthesizing vibrant and stable dyes and pigments, particularly in the red to violet color spectrum. It is an essential raw material for manufacturers in the textile, ink, and specialty coatings industries seeking consistent colorant performance.

Application

• Primary Intermediate for Dyes & Pigments: Key precursor in the manufacture of acid dyes, direct dyes, and reactive dyes for textiles like wool, silk, and nylon.
• Ink Formulation: Used in the production of colorants for printing inks, including those for packaging and security applications.
• Specialty Coatings: Employed in creating colored coatings for paper, leather, and other specialty surfaces.
• Laboratory & Research: Serves as a standard or reagent in chemical research focused on azo compound synthesis and dye chemistry.
• Colorant for Non-Textile Substrates: Potential use in coloring plastics, soaps, and detergents where specific color fastness is required.

Basic Information

Product Name	3-Hydroxy-4-[(4-Methyl-2-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	61617-66-1
Molecular Formula	C17H12N2Na3O10S3
Molecular Weight	586.43 g/mol
Synonyms	Acid Red 337; C.I. 17030; Sodium 3-hydroxy-4-[(4-methyl-2-sulfophenyl)azo]naphthalene-2,7-disulfonate; 3-Hydroxy-4-[(4-methyl-2-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt; Trisodium 3-hydroxy-4-[(4-methyl-2-sulphophenyl)azo]naphthalene-2,7-disulphonate; Azo dye intermediate 61617-66-1; 4-[(4-Methyl-2-sulfophenyl)azo]-3-hydroxy-2,7-naphthalenedisulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Our 3-Hydroxy-4-[(4-Methyl-2-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt is produced under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistent strength, and precise color value. Certificates of Analysis (COA) detailing purity, impurity profile, and physical specifications 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 room temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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