Description

4-[(4-Amino-2-sodiosulfophenyl)azo]-2-ethoxy-1'-hydroxy-6'-[[4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoyl]amino][1,2'-azobisnaphthalene]-3',6-disulfonic acid disodium salt is a high-purity, complex disazo dye intermediate essential for producing vibrant and stable colorants. This compound is valued for its ability to impart strong, lightfast hues, particularly in the red to violet spectrum, making it a critical component for advanced dye synthesis. It is primarily required by manufacturers in the textile, ink, and specialty polymer industries seeking to develop high-performance pigments and dyes.

Application

• Textile Dyeing: A key intermediate for synthesizing high-grade, wash-fast, and light-fast azo dyes for cotton, wool, and synthetic fibers.
• Ink Manufacturing: Used in the production of pigments for industrial inks, including those for packaging, printing, and security applications.
• Plastic and Polymer Coloring: Serves as a precursor for organic pigments used to color plastics, masterbatches, and synthetic resins.
• Liquid Crystal Display (LCD) Color Filters: Potential application in the synthesis of high-purity pigments for electronic display technologies.
• Biological Staining: May be utilized in the development of specialized histological stains for microscopy and research.
• Specialty Coatings: Used to create custom colorants for high-performance paints and industrial coatings requiring specific chromatic properties.

Basic Information

Product Name	4-[(4-Amino-2-sodiosulfophenyl)azo]-2-ethoxy-1'-hydroxy-6'-[[4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoyl]amino][1,2'-azobisnaphthalene]-3',6-disulfonic acid disodium salt
CAS No.	6428-23-5
Molecular Formula	C46H32N8Na2O14S4
Molecular Weight	1086.0 g/mol (approx.)
Synonyms	Acid Red 337; C.I. 17200; Disodium 4-[(4-amino-2-sulfonatophenyl)azo]-2-ethoxy-1'-hydroxy-6'-[[4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoyl]amino][1,2'-azobisnaphthalene]-3',6-disulfonate; 6428-23-5; Azo dye intermediate 6428-23-5; Disazo dye intermediate; 1,2'-Azobisnaphthalene derivative
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation. A Certificate of Analysis (COA) detailing specifications such as assay, impurity profile, and physical characteristics is provided with every 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 a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark red to violet powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.