Description

3-[[4-[(p-Ethoxyphenyl)Azo]-2,5-Dimethoxyphenyl]Azo]Benzenesulphonic Acid is a high-purity azo dye intermediate and specialty chemical compound, identified by CAS No. 25124-87-2. It is valued for its precise molecular structure, which provides excellent chromophoric properties and reactivity for synthesizing complex colorants. This product is essential for manufacturers in the dye and pigment industry, as well as for research institutions developing advanced functional materials.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments.
• Key precursor in the production of textile colorants for natural and synthetic fibers.
• Used in the formulation of specialized inks for printing and packaging applications.
• Component in the research and development of functional dyes for optical and electronic devices.
• Employed in the manufacturing of colorants for plastics and polymers.
• Utilized in analytical chemistry as a reference standard or reagent.

Basic Information

Product Name	3-[[4-[(p-Ethoxyphenyl)Azo]-2,5-Dimethoxyphenyl]Azo]Benzenesulphonic Acid
CAS No.	25124-87-2
Molecular Formula	C22H22N4O6S
Molecular Weight	470.50 g/mol
Synonyms	Benzenesulfonic acid, 3-[[4-[(4-ethoxyphenyl)azo]-2,5-dimethoxyphenyl]azo]-; 3-((4-((4-Ethoxyphenyl)diazenyl)-2,5-dimethoxyphenyl)diazenyl)benzenesulfonic acid; Acid Red 359; C.I. 25290; Azo dye intermediate 25124-87-2; 4-[(4-Ethoxyphenyl)azo]-2,5-dimethoxy-3-(phenylazo)benzenesulphonic acid; 3-[(4-[(4-Ethoxyphenyl)azo]-2,5-dimethoxyphenyl)azo]benzenesulfonic acid
EINECS	Contact for details

Quality Control

Our 3-[[4-[(p-Ethoxyphenyl)Azo]-2,5-Dimethoxyphenyl]Azo]Benzenesulphonic Acid is produced under strict quality management systems. Every batch undergoes rigorous analytical testing, including HPLC and spectroscopic methods, to ensure high purity and batch-to-batch consistency. Certificates of Analysis (COA) detailing identity, purity, and impurity profiles 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). Keep away from strong oxidizing agents and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark red to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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