Description

8-[[5-Anilinosulphonyl-2-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonic Acid is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for producing vivid and stable colorants, particularly in the textile and specialty chemical sectors. This compound is essential for manufacturers and R&D facilities involved in the synthesis of dyes, pigments, and functional colorants for industrial applications.

Application

• Primary intermediate for the synthesis of azo dyes and pigments used in textile coloration.
• Key precursor in the production of specialty colorants for inks, coatings, and plastics.
• Used in research and development for creating novel functional dyes with specific optical properties.
• Potential intermediate in the manufacture of biological stains and analytical reagents.
• Employed in the synthesis of complexometric indicators for chemical analysis.
• Serves as a building block for high-performance pigments requiring excellent light and wash fastness.

Basic Information

Product Name	8-[[5-Anilinosulphonyl-2-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonic Acid
CAS No.	85409-52-5
Molecular Formula	C23H17N3O8S3
Molecular Weight	575.59 g/mol
Synonyms	Acid Red 337; C.I. 17200; 8-[(5-Anilinosulfonyl-2-methylphenyl)azo]-7-hydroxynaphthalene-1,3-disulfonic acid; 7-Hydroxy-8-[[5-[(phenylamino)sulfonyl]-2-methylphenyl]azo]-1,3-naphthalenedisulfonic acid; 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[5-[(phenylamino)sulfonyl]-2-methylphenyl]azo]-; C.I. Acid Red 337; Dye intermediate for Acid Red 337; Azo dye intermediate 85409-52-5
EINECS	Contact for details

Quality Control

Our production of 8-[[5-Anilinosulphonyl-2-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. The material is characterized and tested against established in-house specifications, which typically include identity confirmation by spectroscopic methods and purity assessment by HPLC. A Certificate of Analysis (COA) detailing specific results for each batch is provided to guarantee compliance with your technical requirements.

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 incompatible materials such as strong oxidizing agents. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided.

Specification

Item	Specification
Appearance	Dark red to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (Area %)
Loss on Drying	≤ 2.0 %
Sulfated Ash	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm

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