Description

1H-Pyrazole-3-carboxylic acid, 4,4'-[1,2-ethenediylbis[(3-sulfo-4,1-phenylene)imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(6-sulfo-3,1-phenylene)azo]]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, hexasodium salt is a high-performance, water-soluble reactive dye intermediate of significant industrial importance. Its complex polyazo structure, featuring multiple sulfonate groups and reactive chlorotriazine moieties, enables the production of dyes with excellent wash-fastness and brilliant shades. This compound is essential for manufacturers requiring advanced colorants for demanding technical textiles and specialty papers.

Application

This reactive dye intermediate is engineered for high-value applications where color performance and durability are critical. Its primary and related uses include:

• Reactive Dye Synthesis: As a key precursor for manufacturing high-grade reactive dyes for cotton, viscose, and other cellulosic fibers.
• Technical Textiles: Production of colorants for automotive fabrics, outdoor apparel, and military textiles requiring superior light and wash fastness.
• Paper Coloring: Used in the manufacture of specialty papers, including security papers and high-quality packaging, where color consistency is vital.
• Leather Dyeing: Application in the dyeing of leather goods to achieve deep, penetrating, and stable colors.
• Ink Formulation: A component in the production of inks for digital textile printing and other advanced printing technologies.
• Research & Development: Serves as a sophisticated building block in chemical research for developing new chromophores and functional dyes.

Basic Information

Item	Details
Product Name	1H-Pyrazole-3-carboxylic acid, 4,4'-[1,2-ethenediylbis[(3-sulfo-4,1-phenylene)imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(6-sulfo-3,1-phenylene)azo]]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, hexasodium salt
CAS No.	73398-37-5
Molecular Formula	C58H28Cl2N18O26S6·6Na
Molecular Weight	Contact for details
Synonyms	Reactive Black 5 (key intermediate); Hexasodium 4,4'-[1,2-ethenediylbis[(3-sulfo-4,1-phenylene)imino(6-chloro-1,3,5-triazine-4,2-diyl)imino]]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylate]; C.I. Reactive Black 5 precursor; Polyazo reactive dye intermediate; Tetrasulfonated bis(monochlorotriazinyl) dye; Azo pyrazole carboxylic acid derivative; Hexasodium salt of a reactive diazo dye
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and performance reliability. Quality is verified through comprehensive analytical methods including HPLC for purity and assay, spectrophotometry for strength assessment, and titration for reactive group content. Certificates of Analysis (COA) documenting purity, impurity profile, and physical specifications are provided with every shipment to support your quality assurance systems.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect reactivity and handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 90%
Color Strength	100% ± 3% (vs. Standard)
Moisture Content	Max. 5.0%
Water Solubility	Completely soluble
pH (1% Solution)	6.0 - 8.0
Reactive Group Content	Contact for details

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