Description

3-Hydroxy-4-[[4-[[4-[(2-Hydroxy-6-Sulfo-1-Naphthalenyl)Azo]-2-Methylphenyl]Methyl]-3-Methylphenyl]Azo]-2,7-Naphthalenedisulfonic Acid is a high-purity, polyfunctional azo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple sulfonic acid groups and azo linkages, makes it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical sectors seeking to produce vivid, colorfast, and chemically stable colorants.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton and other cellulosic fibers, providing excellent wash and light fastness.
• Manufacture of Acid Dyes: Used in the production of acid dyes for wool, silk, and nylon, offering bright shades and good leveling properties.
• Production of Direct Dyes: Serves as a crucial component for direct dyes, which are applied directly to textiles in a neutral or alkaline bath.
• Specialty Pigments and Inks: Employed in the formulation of specialty pigments and inks for packaging, security printing, and high-value applications requiring specific color properties.
• Research & Development: Utilized in chemical R&D for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Analytical Reagent: Can function as a complexometric indicator or a staining agent in specific analytical and biological protocols.

Basic Information

Product Name	3-Hydroxy-4-[[4-[[4-[(2-Hydroxy-6-Sulfo-1-Naphthalenyl)Azo]-2-Methylphenyl]Methyl]-3-Methylphenyl]Azo]-2,7-Naphthalenedisulfonic Acid
CAS No.	73507-52-5
Molecular Formula	C35H26N4O11S3
Molecular Weight	774.79 g/mol
Synonyms	Acid Black 210; C.I. 300310; 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-((4-((4-((2-hydroxy-6-sulfo-1-naphthalenyl)azo)-2-methylphenyl)methyl)-3-methylphenyl)azo)-; Reactive Black 5 related intermediate; Trisulfonated azo dye intermediate; Polyazo dye precursor; Tetrasodium 3-hydroxy-4-((4-((4-((2-hydroxy-6-sulfo-1-naphthalenyl)azo)-2-methylphenyl)methyl)-3-methylphenyl)azo)naphthalene-2,7-disulfonate (salt form)
EINECS	Contact for details

Quality Control

Our production of 3-Hydroxy-4-[[4-[[4-[(2-Hydroxy-6-Sulfo-1-Naphthalenyl)Azo]-2-Methylphenyl]Methyl]-3-Methylphenyl]Azo]-2,7-Naphthalenedisulfonic Acid adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical data are provided with each shipment to guarantee traceability and 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%
Solubility (Water)	Soluble, clear solution

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