Description

Tetrasodium 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(4-Sulphonatophenyl)Azo]Phenyl]-N,N,o-Azoxy]Stilbene-2,2'-Disulphonate is a high-purity, water-soluble anionic dye belonging to the stilbene class, valued for its brilliant optical properties and chemical stability. This compound is engineered to deliver consistent, intense coloration and fluorescence, making it a critical component in advanced industrial formulations. It is primarily sought after by manufacturers in the textile, paper, and specialty chemical sectors for applications requiring reliable and vivid dyes.

Application

• Textile Dyeing and Printing: Used as a key dye for cotton, wool, silk, and nylon, providing excellent wash and light fastness.
• Paper Coloring: Imparts bright, stable colors to high-quality papers, including specialty and decorative grades.
• Liquid Detergent and Soap Formulations: Acts as a colorant in household and industrial cleaning products.
• Leather Finishing: Employed in dyeing leather goods to achieve uniform and vibrant finishes.
• Inkjet Inks: Serves as a colorant in inks for digital textile and wide-format printing.
• Biological Staining (Research Grade): Used in laboratory settings as a fluorescent stain or tracer in specific biochemical assays.
• Polymer and Plastic Coloring: Incorporated into certain polymers and plastics where water solubility and thermal stability are required.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(4-Sulphonatophenyl)Azo]Phenyl]-N,N,o-Azoxy]Stilbene-2,2'-Disulphonate
CAS No.	93982-65-1
Molecular Formula	C46H36N8Na4O18S4
Molecular Weight	~1180.0 g/mol
Synonyms	Direct Yellow 11; C.I. 40000; Tetrasodium 4,4'-bis(2-methoxy-5-methyl-4-((4-sulfonatophenyl)diazenyl)phenoxy)stilbene-2,2'-disulfonate; Stilbene Yellow; 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(4-Sulfonatophenyl)Azo]Phenoxy]]Stilbene-2,2'-Disulfonic Acid Tetrasodium Salt; Fluorescent Brightener for specific substrates; Anionic Stilbene Dye
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[2-Methoxy-5-Methyl-4-[(4-Sulphonatophenyl)Azo]Phenyl]-N,N,o-Azoxy]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch is tested to ensure consistent purity, color strength, and solubility, meeting the high standards required for industrial dye applications. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical properties are provided with each shipment and are available upon request.

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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Water Solubility	Clear solution at 1%
Moisture (Karl Fischer)	≤ 5.0%
Ash Content (Sulfated)	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm

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