Description

1-(2-Chloro-5-Sulfophenyl)-3-Methyl-4-(4-Sulfophenyl)Azo-2-Pyrazolin-5-One Disodium Salt is a high-purity, water-soluble azo pyrazolone dye intermediate. This compound is valued for its ability to impart bright, stable shades, particularly in the yellow to orange spectrum, and is a key building block for more complex colorants. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance dyes and pigments.

Application

• Textile Dyeing & Printing: A critical intermediate for synthesizing reactive, acid, and direct dyes used on cotton, wool, silk, and nylon fabrics.
• Ink Manufacturing: Used in the production of pigments for inks in packaging, textiles, and digital printing applications.
• Specialty Pigments: Serves as a precursor for creating high-value organic pigments with excellent lightfastness and weather resistance.
• Paper Coloring: Employed in the manufacture of dyes for coloring paper and paperboard products.
• Leather Dyeing: An intermediate for dyes used in the leather tanning and finishing industry.
• Research & Development: Used in chemical research for developing novel chromophores and studying azo dye chemistry.

Basic Information

Product Name	1-(2-Chloro-5-Sulfophenyl)-3-Methyl-4-(4-Sulfophenyl)Azo-2-Pyrazolin-5-One Disodium Salt
CAS No.	91101-24-5
Molecular Formula	C16H10ClN4Na2O7S2
Molecular Weight	523.84 g/mol
Synonyms	Acid Yellow 219; C.I. 18995; 2-Pyrazolin-5-one, 1-(2-chloro-5-sulfophenyl)-3-methyl-4-[(4-sulfophenyl)azo]-, disodium salt; Disodium 1-(2-chloro-5-sulfophenyl)-3-methyl-4-[(4-sulfophenyl)azo]-5-oxo-2-pyrazoline; 1-(2-Chloro-5-sulfophenyl)-3-methyl-4-[(4-sulfophenyl)azo]-5-pyrazolone disodium salt; Azo pyrazolone dye intermediate; Yellow 219
EINECS	Contact for details

Quality Control

Our 1-(2-Chloro-5-Sulfophenyl)-3-Methyl-4-(4-Sulfophenyl)Azo-2-Pyrazolin-5-One Disodium Salt is manufactured under strict quality management systems. 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 assay, impurity profile, and physical properties is provided with each shipment.

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); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which may affect product performance.

Specification

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

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