Description

3-[[4,5-Dihydro-3-Methyl-5-Oxo-1-(4-Sulfophenyl)-1H-Pyrazol-4-Yl]Azo]Benzenesulfonic Acid is a high-purity, water-soluble azo dye intermediate characterized by its dual sulfonic acid groups, which impart excellent solubility and binding properties. This compound is a critical building block for synthesizing specialized dyes and pigments, offering superior color fastness and stability in demanding formulations. It is primarily sought by manufacturers in the textile, ink, and specialty chemical industries for producing vibrant, high-performance colorants.

Application

• Textile Dye Intermediate: A key precursor for manufacturing acid dyes and reactive dyes used on nylon, wool, silk, and other protein fibers.
• Inkjet Ink Formulation: Used in the synthesis of pigments for high-quality, water-based inkjet inks requiring excellent color gamut and stability.
• Paper Coloring Agent: Serves as an intermediate for dyes applied in the coloring of specialty papers and packaging materials.
• Leather Dye Production: Employed in creating dyes for the leather tanning and finishing industry.
• Biological Staining: Potential use as an intermediate for histological stains and indicators in laboratory settings.
• Functional Material Synthesis: Acts as a monomer or intermediate in the development of functional polymers and materials.

Basic Information

Product Name	3-[[4,5-Dihydro-3-Methyl-5-Oxo-1-(4-Sulfophenyl)-1H-Pyrazol-4-Yl]Azo]Benzenesulfonic Acid
CAS No.	181819-97-6
Molecular Formula	C16H14N4O7S2
Molecular Weight	438.43 g/mol
Synonyms	Acid Yellow 219 (Pyrazolone); 3-[(4,5-Dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl)azo]benzenesulfonic acid; Benzenesulfonic acid, 3-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl]azo]-; C.I. 18995; 1-(4-Sulfophenyl)-3-methyl-4-[(3-sulfophenyl)azo]-5-pyrazolone; Pyrazolone Yellow intermediate; Azo pyrazolone sulfonic acid
EINECS	Contact for details

Quality Control

Our production of 3-[[4,5-Dihydro-3-Methyl-5-Oxo-1-(4-Sulfophenyl)-1H-Pyrazol-4-Yl]Azo]Benzenesulfonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing assay, impurity profile, and physical characteristics are provided to guarantee traceability and product integrity for your manufacturing processes.

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 and handling.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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