Description

Disodium 3-Ethyl 4,5-Dihydro-5-Oxo-4-[(4-Sulphonato-1-Naphthyl)Azo]-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate is a high-purity, water-soluble azo pyrazolone dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for synthesizing vibrant and stable acid dyes and pigments, particularly for polyamide fibers like nylon and wool. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce high-quality, colorfast products.

Application

• Primary Intermediate for Acid Dyes: Serves as the crucial building block for manufacturing a range of red and orange acid dyes used on nylon, wool, and silk.
• Textile Dyeing: Imparts excellent wash and light fastness properties to synthetic and natural protein fibers.
• Leather Coloring: Used in the production of dyes for high-quality leather finishing, offering deep, uniform shades.
• Paper Dyeing: Employed in specialty paper applications where specific color tones and stability are required.
• Ink Formulation: A component in the synthesis of pigments for inks, including those for packaging and security printing.
• Research & Development: Used in chemical research for developing new dye molecules and studying azo coupling reactions.

Basic Information

Item	Details
Product Name	Disodium 3-Ethyl 4,5-Dihydro-5-Oxo-4-[(4-Sulphonato-1-Naphthyl)Azo]-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate
CAS No.	15139-76-1
Molecular Formula	C24H18N4Na2O9S2
Molecular Weight	632.52 g/mol
Synonyms	Acid Red 337 (C.I. 17200); Disodium 3-ethyl-4,5-dihydro-5-oxo-4-[(4-sulfo-1-naphthyl)azo]-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylate; C.I. 17200; 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-4-[(4-sulfo-1-naphthalenyl)azo]-1-(4-sulfophenyl)-3-ethyl-, disodium salt; Azo pyrazolone dye intermediate; Acid dye intermediate for nylon
EINECS	Contact for details

Quality Control

Our production of Disodium 3-Ethyl 4,5-Dihydro-5-Oxo-4-[(4-Sulphonato-1-Naphthyl)Azo]-1-(4-Sulphonatophenyl)-1H-Pyrazole-3-Carboxylate adheres to stringent quality management systems to ensure batch-to-batch consistency and high purity. Every lot undergoes rigorous analytical testing, including HPLC for assay and impurity profiling. Certificates of Analysis (COA) detailing purity, identity, and specific parameters are provided with each shipment 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). Keep away from strong oxidizing agents. Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.0 - 8.0

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