Description

4-[4,5-Dihydro-3-Methyl-4-[(4-Sodiosulfophenyl)Azo]-5-Thioxo-1H-Pyrazol-1-Yl]Benzenesulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate essential for producing vibrant and stable colorants. Its value lies in its precise chemical structure, which enables the synthesis of specialized dyes with excellent fastness properties for demanding industrial applications. This compound is primarily needed by manufacturers in the textile, leather, and specialty ink industries seeking reliable intermediates for high-performance dye production.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton and other cellulosic fibers.
• Leather Dyeing: Used in the production of dyes that provide deep, uniform coloration and good adhesion to leather substrates.
• Specialty Ink Formulation: Serves as a precursor for pigments used in inks requiring specific color shades and stability.
• Paper Coloring: Employed in the manufacture of dyes for high-grade paper products.
• Research & Development: Utilized in chemical R&D for developing new azo-based colorants and studying structure-property relationships.

Basic Information

Product Name	4-[4,5-Dihydro-3-Methyl-4-[(4-Sodiosulfophenyl)Azo]-5-Thioxo-1H-Pyrazol-1-Yl]Benzenesulfonic Acid Sodium Salt
CAS No.	77958-63-5
Molecular Formula	C16H13N4Na2O6S3
Molecular Weight	514.46 g/mol
Synonyms	Benzenesulfonic acid, 4-[4,5-dihydro-3-methyl-4-[(4-sulfophenyl)azo]-5-oxo-1H-pyrazol-1-yl]-, disodium salt; C.I. Reactive Yellow 42 intermediate; Disodium 4-[4,5-dihydro-3-methyl-4-[(4-sulfonatophenyl)hydrazinylidene]-5-oxo-1H-pyrazol-1-yl]benzenesulfonate; Azo pyrazolone sulfonate; Reactive dye intermediate Y-42; 1-(4-Sulfophenyl)-3-methyl-4-((4-sulfophenyl)azo)-5-pyrazolone disodium salt
EINECS	Contact for details

Quality Control

Our 4-[4,5-Dihydro-3-Methyl-4-[(4-Sodiosulfophenyl)Azo]-5-Thioxo-1H-Pyrazol-1-Yl]Benzenesulfonic Acid Sodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure high purity and consistent performance as a dye intermediate. Comprehensive Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are available upon request to support your quality assurance protocols.

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 quality.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Solubility (in Water)	Clear solution
Heavy Metals (as Pb)	≤ 20 ppm

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