Description

Sodium 3-[[4-[(4-Ethoxyphenyl)Azo]-5-Methoxy-o-Tolyl]Azo]Benzenesulphonate is a high-purity azo dye intermediate essential for producing vivid and stable colorants. Its value lies in its specific molecular structure, which enables the synthesis of dyes with excellent light and wash fastness properties. This compound is a critical raw material for manufacturers in the textile, ink, and specialty coatings industries seeking consistent, high-performance pigments.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-performance red and orange azo dyes and pigments.
• Textile Dyeing and Printing: Used in the production of dyes for coloring natural and synthetic fibers, including cotton, polyester, and nylon.
• Ink Manufacturing: Employed in formulating industrial and specialty printing inks, such as those for packaging and publications.
• Pigment Production: Acts as a precursor for creating organic pigments used in plastics, paints, and coatings.
• Leather Coloring: Utilized in the manufacture of dyes for the leather tanning and finishing industry.
• Paper Coloring: Applied in the production of dyes for specialty paper and paperboard products.
• Research & Development: Serves as a standard or experimental compound in chemical research for developing new colorant technologies.

Basic Information

Item	Details
Product Name	Sodium 3-[[4-[(4-Ethoxyphenyl)Azo]-5-Methoxy-o-Tolyl]Azo]Benzenesulphonate
CAS No.	72138-85-3
Molecular Formula	C22H21N4NaO5S
Molecular Weight	476.48 g/mol
Synonyms	3-[[4-[(4-Ethoxyphenyl)azo]-5-methoxy-2-methylphenyl]azo]benzenesulfonic acid sodium salt; Sodium 3-((4-((4-ethoxyphenyl)diazenyl)-5-methoxy-2-methylphenyl)diazenyl)benzenesulfonate; Azo dye intermediate 72138-85-3; Benzenesulfonic acid, 3-[[4-[(4-ethoxyphenyl)azo]-5-methoxy-2-methylphenyl]azo]-, sodium salt; C.I. Disperse Red 338 (related intermediate); Diazo component for azo dyes
EINECS	Contact for details

Quality Control

Our Sodium 3-[[4-[(4-Ethoxyphenyl)Azo]-5-Methoxy-o-Tolyl]Azo]Benzenesulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and chemical identity. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance and regulatory compliance needs.

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 heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in water, DMF; slightly soluble in ethanol

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