Description

Tetrasodium 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(3-Sulphonatophenyl)Azo]Phenyl]-O,N,n-Azoxy]Stilbene-2,2'-Disulphonate is a high-purity, water-soluble anionic dye belonging to the stilbene class, known for its brilliant optical properties. This compound matters for its exceptional ability to provide intense, stable coloration and fluorescence, making it a critical component in advanced material formulations. It is primarily needed by manufacturers in the textile, paper, and specialty chemical industries seeking high-performance optical brighteners and functional dyes.

Application

• Optical Brightening Agent (OBA) for high-quality papers, textiles, and detergents to enhance whiteness and brightness.
• Functional Dye in the production of security inks, specialty coatings, and high-visibility materials.
• Fluorescent Tracer in industrial processes, water flow studies, and leak detection systems.
• Research & Development chemical for analytical chemistry, photochemistry, and material science studies.
• Textile Dyeing & Printing, particularly for cellulosic fibers where bright, wash-fast colors are required.
• Polymer Additive to impart specific optical characteristics to plastics and synthetic fibers.

Basic Information

Item	Details
Product Name	Tetrasodium 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(3-Sulphonatophenyl)Azo]Phenyl]-O,N,n-Azoxy]Stilbene-2,2'-Disulphonate
CAS No.	83817-39-4
Molecular Formula	C48H38N8Na4O20S4
Molecular Weight	~1250.0 g/mol (Contact for exact details)
Synonyms	Stilbene Brightener 4B; Fluorescent Brightener 351; Tetrasodium 4,4'-bis(2-methoxy-5-methyl-4-((3-sulfonatophenyl)diazenyl)phenoxy)stilbene-2,2'-disulfonate; C.I. Fluorescent Brightener 351; 4,4'-Bis[[4-[(3-sulfophenyl)azo]-2-methoxy-5-methylphenyl]azoxy]stilbene-2,2'-disulfonic acid tetrasodium salt; Optical Brightener 351; FBA 351
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(3-Sulphonatophenyl)Azo]Phenyl]-O,N,n-Azoxy]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and spectrophotometry for strength and shade, to ensure consistency and compliance with industry specifications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance and handling properties.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95.0%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	Max. 20 ppm

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