Description

4-Hydroxy-5-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]-3-[(4-methoxyphenyl)azo]-2,7-naphthalenedisulfonic acid is a high-purity, synthetic azo dye intermediate of significant industrial importance. Its complex polyazo structure is engineered to deliver exceptional color strength and chromophore stability, making it a critical component for producing high-performance dyes and pigments. This compound is primarily sought by manufacturers in the textile, ink, and specialty coatings industries who require reliable, consistent raw materials for their formulations.

Application

• Primary intermediate for the synthesis of high-grade azo dyes, particularly for textile fibers like cotton, wool, and nylon.
• Manufacturing of pigments for industrial inks, including those used in packaging and printing.
• Production of colorants for specialty coatings and paints requiring specific lightfastness and chemical resistance.
• Research and development of novel functional dyes for non-textile applications, such as in optical media or sensors.
• Used in laboratories as a reference standard or analytical reagent for quality control in dye manufacturing processes.

Basic Information

Product Name	4-Hydroxy-5-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]-3-[(4-methoxyphenyl)azo]-2,7-naphthalenedisulfonic acid
CAS No.	68134-21-4
Molecular Formula	C39H28N8O14S3
Molecular Weight	928.87 g/mol
Synonyms	Acid Black 210; C.I. 300310; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]-3-[(4-methoxyphenyl)azo]-; Polyazo dye intermediate; Black 210 dye intermediate; Azo Black 210; CAS 68134-21-4
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques like HPLC and spectrophotometry to verify critical parameters including assay, impurity profile, and color value. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance and regulatory compliance 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). Keep away from strong acids and organic solvents. Due to its light-sensitive nature, containers should be opaque or stored in darkness to prevent degradation.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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