Description

2-[[1-(2,5-Dichloro-4-Sulfophenyl)-3-Methyl-1H-Pyrazol-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vivid and stable color properties in demanding applications. It is primarily sought after by manufacturers in the textile, ink, and specialty chemical industries for the synthesis of high-performance dyes and pigments.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing reactive dyes used in cotton and cellulose fiber dyeing.
• Textile Colorant Production: Used in the manufacture of acid and direct dyes for wool, silk, and nylon.
• Inkjet and Printing Inks: Serves as a colorant precursor in the formulation of high-quality inks for digital and industrial printing.
• Specialty Pigment Synthesis: Employed in the production of pigments for plastics, coatings, and masterbatches.
• Laboratory and R&D: Used as a reference standard and for developing new chromogenic compounds in chemical research.
• Paper Coloring: Intermediate for dyes used in the surface coloring and coating of specialty papers.

Basic Information

Item	Details
Product Name	2-[[1-(2,5-Dichloro-4-Sulfophenyl)-3-Methyl-1H-Pyrazol-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	73287-66-8
Molecular Formula	C20H12Cl2N4Na2O6S2
Molecular Weight	593.34 g/mol
Synonyms	Acid Red 337; C.I. 17200; Reactive Red 195 intermediate; 2-Naphthalenesulfonic acid, 2-[[1-(2,5-dichloro-4-sulfophenyl)-3-methyl-1H-pyrazol-4-yl]azo]-, disodium salt; 1-Naphthalenesulfonic acid, 2-[[1-(2,5-dichloro-4-sulfophenyl)-3-methyl-1H-pyrazol-4-yl]azo]-, disodium salt; Disodium 2-[[1-(2,5-dichloro-4-sulfophenyl)-3-methyl-1H-pyrazol-4-yl]azo]-1-naphthalenesulphonate; Azo dye intermediate 73287-66-8
EINECS	Contact for details

Quality Control

Our 2-[[1-(2,5-Dichloro-4-Sulfophenyl)-3-Methyl-1H-Pyrazol-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for dye intermediate applications. Certificates of Analysis (COA) documenting purity, heavy metal content, and other critical parameters 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 to prevent absorption of atmospheric moisture. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear solution

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