Description

Tetrasodium 4,4'-Bis[[2-Methoxy-4-[(4-Methoxy-3-Sulphonatophenyl)Azo]-5-Methylphenyl]Azo]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 exceptional color strength and fastness, making it a critical component in demanding industrial coloration processes. It is primarily required by manufacturers in the textile, paper, and specialty ink industries for producing vivid, durable colors.

Application

• Textile Dyeing: Used for dyeing cotton, wool, silk, and nylon, providing excellent wash and light fastness.
• Paper Coloring: Imparts bright, stable coloration to high-grade papers, including specialty and decorative papers.
• Ink Formulation: A key pigment for manufacturing inks used in flexographic, gravure, and inkjet printing.
• Leather Finishing: Applied in the dyeing of leather goods to achieve consistent and vibrant shades.
• Detergent & Soap: Functions as a colorant in laundry detergents and soaps to enhance product appearance.
• Biological Staining: Potential use as a fluorescent stain or marker in certain biochemical and histological applications.
• Plastics & Polymers: Can be incorporated for coloring certain types of plastics and synthetic fibers.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[2-Methoxy-4-[(4-Methoxy-3-Sulphonatophenyl)Azo]-5-Methylphenyl]Azo]Stilbene-2,2'-Disulphonate
CAS No.	85188-15-4
Molecular Formula	C46H36N8Na4O16S4
Molecular Weight	~1189.0 g/mol
Synonyms	Direct Yellow 11; C.I. 40000; Stilbene Yellow; Tetrasodium 4,4'-bis(2-methoxy-4-((4-methoxy-3-sulfonatophenyl)azo)-5-methylphenyl)azo)stilbene-2,2'-disulfonate; 4,4'-Bis[[2-Methoxy-4-[(4-Methoxy-3-Sulfonatophenyl)Azo]-5-Methylphenyl]Azo]-2,2'-Stilbenedisulfonic Acid Tetrasodium Salt; Brilliant Yellow; Acid Yellow 11 (related class).
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[2-Methoxy-4-[(4-Methoxy-3-Sulphonatophenyl)Azo]-5-Methylphenyl]Azo]Stilbene-2,2'-Disulphonate adheres to stringent quality protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed for critical parameters including color strength, purity, solubility, and impurity profile. Comprehensive Certificates of Analysis (COA) documenting these results are provided to guarantee the product meets your specific application requirements and industry standards.

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 material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to Orange-Brown Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely Soluble
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm
Ash Content	Contact for details

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