Description

7-(Benzoylamino)-4-Hydroxy-3-[[4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart vivid and stable color properties in advanced dye synthesis. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance dyes and pigments. Consistent quality and reliable supply are critical for ensuring batch-to-batch uniformity in final colored products.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of acid dyes and direct dyes for textiles like wool, silk, and nylon.
• Pigment Manufacturing: Used in the production of high-quality, light-fast organic pigments for inks and coatings.
• Specialty Chemical Synthesis: Serves as a precursor for research and development of novel colorants and functional dyes.
• Laboratory Reagent: Employed as a standard or reagent in analytical chemistry and dye research laboratories.
• Paper Coloring: Potential use in the manufacturing of specialty colored papers where water-soluble dyes are required.

Basic Information

Product Name	7-(Benzoylamino)-4-Hydroxy-3-[[4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt
CAS No.	83221-50-5
Molecular Formula	C29H19N5O7S2•Na
Molecular Weight	668.61 g/mol
Synonyms	Acid Red 337; C.I. 17200; Sodium 7-(benzoylamino)-4-hydroxy-3-({4-[(4-sulfophenyl)diazenyl]phenyl}diazenyl)naphthalene-2-sulfonate; 7-Benzamido-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-2-naphthalenesulfonic acid sodium salt; Benzenesulfonic acid, 4-((4-((7-(benzoylamino)-4-hydroxy-3-sulfo-2-naphthalenyl)azo)phenyl)azo)-, sodium salt (1:2); Azo dye intermediate 83221-50-5
EINECS	Contact for details

Quality Control

Our production of 7-(Benzoylamino)-4-Hydroxy-3-[[4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure high purity, consistent color strength, and compliance with industry specifications. Certificates of Analysis (COA) detailing purity, assay, and impurity profiles are available upon request to support your quality assurance 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 product is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

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.