Description

4-[4-[[5-[Acetyl(Ethyl)Amino]-2-Methylphenyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]-3-Chlorobenzenesulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate essential for producing vibrant and stable colorants. Its molecular structure is engineered to deliver excellent lightfastness and thermal stability in demanding applications. This compound is a critical raw material for manufacturers in the textile, ink, and specialty polymer industries seeking consistent quality and reliable supply chains.

Application

• Textile Dyeing: A key intermediate for synthesizing reactive and acid dyes for coloring nylon, wool, and silk fibers.
• Inkjet Inks: Used in the formulation of high-performance inks for digital printing, providing bright colors and good water-fastness.
• Paper Coloring: Employed in the production of specialty papers requiring specific, durable color shades.
• Leather Finishing: Acts as a colorant intermediate in dyes for leather goods, offering good penetration and color yield.
• Polymer Staining: Utilized to impart color to certain engineering plastics and synthetic materials during manufacture.
• Biological Staining: Serves as a precursor for certain histological stains used in laboratory microscopy.
• Liquid Crystal Displays (LCDs): Potential use in color filter applications for electronic displays.

Basic Information

Product Name	4-[4-[[5-[Acetyl(Ethyl)Amino]-2-Methylphenyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]-3-Chlorobenzenesulfonic Acid Sodium Salt
CAS No.	6359-93-9
Molecular Formula	C21H21ClN5O5SNa
Molecular Weight	529.93 g/mol
Synonyms	Acid Red 337; C.I. 17210; Sodium 4-[4-[[5-[acetyl(ethyl)amino]-2-methylphenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-3-chlorobenzenesulfonate; 3-Chloro-4-[4-[[5-[N-ethylacetamido]-2-methylphenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonic Acid Sodium Salt; 1-(3-Chloro-4-sulfophenyl)-3-methyl-4-[[5-(N-ethylacetamido)-2-methylphenyl]azo]-5-pyrazolone Sodium Salt; Azo Dye Intermediate 6359-93-9; Benzenesulfonic acid, 3-chloro-4-[4-[[5-[acetyl(ethyl)amino]-2-methylphenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-, sodium salt
EINECS	228-785-8

Quality Control

Our production of 4-[4-[[5-[Acetyl(Ethyl)Amino]-2-Methylphenyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]-3-Chlorobenzenesulfonic Acid Sodium Salt adheres to a stringent quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical properties 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). This material is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed to minimize exposure to atmospheric moisture and light to prevent degradation.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
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.