Description

4-Hydroxy-3-[[4'-[[4-[[(4-Methylphenyl)Sulfonyl]Oxy]Phenyl]Azo]-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity, synthetic organic dye intermediate belonging to the azo and disulfonic acid chemical classes. This compound is valued for its strong chromophoric properties and ability to form stable, vivid colorants, making it a critical component in the production of specialized dyes and pigments. It is primarily sought after by manufacturers in the textile, ink, and specialty coatings industries for creating high-performance colorants with excellent light and wash fastness.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-value, complex azo dyes for textiles and leather.
• Specialty Ink Formulations: Used in the production of pigments for high-quality printing inks, including those for packaging and security applications.
• Industrial Coatings and Paints: Imparts durable coloration to industrial coatings where chemical resistance is required.
• Research & Development: Employed in chemical research as a model compound for studying azo coupling reactions and dye chemistry.
• Functional Material Synthesis: Potential use in the development of colorimetric sensors and advanced organic materials due to its conjugated structure.

Basic Information

Product Name	4-Hydroxy-3-[[4'-[[4-[[(4-Methylphenyl)Sulfonyl]Oxy]Phenyl]Azo]-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	6358-34-5
Molecular Formula	C41H28N4O10S3Na2
Molecular Weight	894.83 g/mol
Synonyms	Acid Red 337; C.I. 17215; Disodium 4-hydroxy-3-[[4'-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonate; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((4'-((4-(((4-methylphenyl)sulfonyl)oxy)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-, disodium salt; Azo dye intermediate 6358-34-5; Direct Red 337 (related class); Pigment Red 337 (related class)
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Every lot is analyzed using modern analytical techniques including HPLC and spectrophotometry to confirm identity and composition. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with each shipment to support your quality assurance and regulatory needs.

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 (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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