Description

3-[[3,3'-Dimethyl-4'-[[4-[[(p-Tolyl)Sulphonyl]Oxy]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vivid and stable color properties in advanced material formulations. It is primarily sought after by manufacturers in the textile, ink, and specialty polymer industries for producing high-performance dyes and pigments.

Application

• Primary Intermediate for Reactive and Direct Dyes: A key building block in the synthesis of high-grade dyes for cotton, wool, and nylon textiles.
• Inkjet and Printing Inks: Used in the formulation of colorants for high-resolution digital and industrial printing applications.
• Functional Polymer Colorants: Imparts color to plastics, resins, and coatings where lightfastness and thermal stability are required.
• Biological Staining Reagents: Serves as a precursor for specialized stains used in histological and cytological analysis.
• Research & Development: Employed in academic and industrial R&D for developing new chromogenic materials and sensors.

Basic Information

Product Name	3-[[3,3'-Dimethyl-4'-[[4-[[(p-Tolyl)Sulphonyl]Oxy]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	93804-33-2
Molecular Formula	C41H30N4O9S3Na2
Molecular Weight	888.85 g/mol
Synonyms	Acid Red 337; C.I. 17200; Sodium 4-hydroxy-3-[[4'-[4-(p-tolylsulfonyloxy)phenylazo]-3,3'-dimethylbiphenyl-4-yl]azo]naphthalene-2,7-disulphonate; 4-Hydroxy-3-[[4'-[4-[(4-methylphenyl)sulfonyloxy]phenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonic acid disodium salt; Reactive Red Dye Intermediate; Azo Dye Intermediate 93804-33-2; Disodium 4-hydroxy-3-({4'-[(4-{[(4-methylphenyl)sulfonyl]oxy}phenyl)diazenyl]-3,3'-dimethyl[1,1'-biphenyl]-4-yl}diazenyl)naphthalene-2,7-disulfonate
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Each lot undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation. A Certificate of Analysis (COA) detailing all relevant specifications 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 after initial use to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Solubility (in Water)	Clear solution
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.