Description

3-(4-Nitrophenylazo)-4-Amino-5-Hydroxy-6-(3-Sulfophenylazo)-2,7-Naphthalenedisulfonic Acid is a high-purity, polyfunctional azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring multiple azo linkages and sulfonic acid groups, makes it a critical precursor for synthesizing high-value, colorfast dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, durable colors with specific technical properties.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments, particularly for textiles and leather.
• Key building block in the production of reactive dyes for cotton and other cellulose fibers, offering excellent wash-fastness.
• Used in manufacturing acid dyes for wool, silk, and nylon, providing bright and level shades.
• Precursor for specialty pigments used in inks, plastics, and industrial coatings.
• Employed in research and development of novel functional dyes for non-textile applications, such as sensors or optical materials.
• Potential use as a biological stain or histochemical agent in laboratory settings, owing to its chromophoric properties.

Basic Information

Product Name	3-(4-Nitrophenylazo)-4-Amino-5-Hydroxy-6-(3-Sulfophenylazo)-2,7-Naphthalenedisulfonic Acid
CAS No.	71173-68-7
Molecular Formula	C22H15N5O11S3
Molecular Weight	629.57 g/mol
Synonyms	Acid Black 210; C.I. 300310; 2,7-Naphthalenedisulfonic acid, 4-amino-3-[(4-nitrophenyl)azo]-5-hydroxy-6-[(3-sulfophenyl)azo]-; 4-Amino-3-[(4-nitrophenyl)azo]-5-hydroxy-6-[(3-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid; 3-(4-Nitrophenylazo)-4-amino-5-hydroxy-6-(3-sulfophenylazo)-2,7-naphthalenedisulfonic acid; Azo dye intermediate 71173-68-7; Black 210 dye intermediate
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high purity. The material is characterized using advanced analytical techniques including HPLC, UV-Vis, and NMR spectroscopy. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every 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 compound is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF Titration)	≤ 5.0%
Ash Content	≤ 1.0%
Water Solubility	Freely soluble

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