Description

4-[[4'-[[2,4-Dihydroxy-5-[(4-Sulphophenyl)Azo]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring multiple azo linkages and sulphonate groups, makes it a critical precursor for synthesizing vibrant and wash-fast dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce high-performance colorants. Its consistent quality and reliable supply are paramount for ensuring batch-to-batch uniformity in final colored products.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton, wool, and nylon, valued for their excellent color fastness and brightness.
• Production of Acid Dyes: Used in the manufacture of acid dyes, which are essential for coloring silk, wool, leather, and paper with strong, vivid hues.
• Specialty Pigment Synthesis: Serves as a precursor for creating complex organic pigments used in high-performance inks, paints, and plastics where superior stability is required.
• Textile Printing Inks: A vital component in formulating advanced textile printing inks, contributing to sharp definition and color consistency.
• Research & Development: Employed in R&D laboratories for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Functional Dyes: Potential use in the synthesis of dyes for non-textile applications, such as in lasers, optical data storage, or as biological stains.

Basic Information

Product Name	4-[[4'-[[2,4-Dihydroxy-5-[(4-Sulphophenyl)Azo]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid, Sodium Salt
CAS No.	94199-53-8
Molecular Formula	C40H26N8O11S2•2Na (or equivalent ionic form)
Molecular Weight	Contact for details
Synonyms	Acid Black 210 (C.I. 300310)
4,5-Dihydro-5-oxo-1-(4-sulfophenyl-4-[[4'-[[2,4-dihydroxy-5-[(4-sulfophenyl)azo]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-1H-pyrazole-3-carboxylic acid, disodium salt
Disodium 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-[[4'-[[2,4-dihydroxy-5-[(4-sulfophenyl)azo]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-1H-pyrazole-3-carboxylate
Reactive Black 5 related intermediate
Azo dye intermediate 94199-53-8
Polyazo dye intermediate
Bis-sulphonated azo pyrazole carboxylic acid
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure purity and performance consistency. Every batch is analyzed using modern analytical techniques including HPLC, UV-Vis spectroscopy, and titration to confirm identity, strength, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing assay, related substances, heavy metals, and other critical parameters is provided with each shipment. We support compliance with global regulatory frameworks, including REACH, and can tailor specifications to meet specific customer requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product stability and handling properties. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (or as per grade)
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%
Solubility (in Water)	Freely soluble

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