Description

Benzoic Acid,2-[(1,8-Dihydroxy-)-[(2-Hydroxy-5-Nitro-3-Sulfophenyl)Azo]-3,6-Disulfo-2-Naphthalenyl)Azo]- is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its complex polyfunctional structure, featuring multiple sulfonic acid and hydroxyl groups, provides excellent water solubility and strong chelating properties for metal ions. This compound is primarily sought by manufacturers in the textile, leather, and specialty ink industries for the production of high-performance, wash-fast dyes and pigments.

Application

• Primary Textile Dye Intermediate: Key precursor for synthesizing acid dyes and direct dyes used on wool, silk, nylon, and paper.
• Leather Coloring Agent: Used in the formulation of dyes for high-quality leather finishing due to its good affinity and color fastness.
• Specialty Ink Production: Serves as a critical component in manufacturing inks for jet printing, packaging, and security applications.
• Metal Complex Dye Synthesis: Its structure is ideal for creating pre-metallized dyes, which offer superior light and wash fastness for automotive and outdoor fabrics.
• Biological Staining: Potential use in the development of histological stains and indicators in analytical chemistry.
• Research & Development: Serves as a valuable building block in organic synthesis and materials science research for novel functional dyes.

Basic Information

Item	Detail
Product Name	Benzoic Acid,2-[(1,8-Dihydroxy-)-[(2-Hydroxy-5-Nitro-3-Sulfophenyl)Azo]-3,6-Disulfo-2-Naphthalenyl)Azo]-
CAS No.	20650-43-5
Molecular Formula	C23H13N5O14S3
Molecular Weight	695.57 g/mol
Synonyms	2-[(1,8-Dihydroxy-3,6-disulfo-2-naphthyl)azo]-5-[(2-hydroxy-5-nitro-3-sulfophenyl)azo]benzoic acid; Acid Black 210; C.I. 300310; Mordant Black 51; Benzoic acid, 2,2'-(1,8-dihydroxy-3,6-disulfo-2,7-naphthalenediyl)bis(azo)bis(5-nitro-3-hydroxybenzenesulfonic acid) derivative; Azo dye intermediate 20650-43-5
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques including HPLC and spectrophotometry to confirm identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); ensure the container is kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Sulfated Ash	≤ 1.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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