Description

5-Chloro-4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethoxy-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex polyazo structure, featuring multiple sulfonate groups, makes it a key precursor for synthesizing high-value, colorfast dyes and pigments, particularly in demanding applications. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant and durable colors.

Application

• Primary Intermediate for Reactive Dyes: Synthesis of high-performance reactive dyes for cotton, wool, and nylon, valued for their excellent wash and light fastness.
• Production of Acid Dyes: Manufacturing of acid dyes used for coloring silk, wool, leather, and paper, where bright shades and good leveling are required.
• Direct Dye Synthesis: Used in the production of direct dyes for cellulosic fibers like cotton and rayon.
• Specialty Pigments and Inks: A key building block for creating complex organic pigments used in high-quality printing inks, paints, and plastics.
• Research & Development: Serves as a valuable chemical entity in academic and industrial R&D for developing novel chromophores and studying azo chemistry.
• Functional Dye Production: Potential use in the synthesis of dyes for non-textile applications, such as in lasers, optical data storage, or as biological stains.

Basic Information

Item	Details
Product Name	5-Chloro-4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethoxy-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt
CAS No.	6473-34-3
Molecular Formula	C34H21ClN4Na3O14S3
Molecular Weight	951.15 g/mol (approx.)
Synonyms	Trisodium 5-chloro-4-hydroxy-3-[[4'-[(1-hydroxy-4-sulphonato-2-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulphonate; C.I. Direct Brown 223; Direct Brown 223; Azo Brown 223; 5-Chloro-4-hydroxy-3-({4'-[(1-hydroxy-4-sulfo-2-naphthyl)diazenyl]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl}diazenyl)naphthalene-2,7-disulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Every batch of our 5-Chloro-4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethoxy-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt is manufactured and tested under a rigorous quality management system. We ensure consistent purity, color strength, and chemical composition to meet the exacting standards of dye and pigment synthesis. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with each shipment to guarantee traceability and compliance.

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 performance and handling.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (Area %)
Loss on Drying	≤ 5.0 %
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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