Description

Tetrasodium 4,4'-Bis[[4-(2-Benzothiazolyl-6-Methyl)Sulphonatophenyl]Azoxy]Stilbene-2,2'-Disulphonate is a high-performance, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-benzothiazole class. Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as a bright blue fluorescence, effectively compensating for yellowish tints and enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects in their finished products.

Application

• Textile Finishing: Widely used for whitening and brightening cotton, nylon, polyester, and blended fabrics during scouring, bleaching, or finishing processes.
• Laundry Detergents & Fabric Softeners: A key additive in premium powder and liquid detergents to impart a "whiter-than-white" appearance to laundered garments.
• Paper Manufacturing: Applied in the coating or pulp slurry to enhance the brightness and visual appeal of high-quality writing, printing, and tissue papers.
• Plastics and Synthetic Fibers: Incorporated into polymers like PVC, polyolefins, and synthetic fibers (e.g., polyamide) to correct inherent yellowness and improve aesthetic quality.
• Soaps and Personal Care Products: Used in certain cosmetic formulations and soaps to increase perceived cleanliness and brightness.
• Advanced Coatings: Employed in specialty paints and coatings where optical brightening properties are required.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[4-(2-Benzothiazolyl-6-Methyl)Sulphonatophenyl]Azoxy]Stilbene-2,2'-Disulphonate
CAS No.	63346-49-6
Molecular Formula	C46H28N6Na4O16S6
Molecular Weight	~1229.0 g/mol
Synonyms	Fluorescent Brightener 220; FB 220; FWA 220; Tinopal CBS-X; 4,4'-Bis[[4-[2-(6-methyl-2-benzothiazolyl)sulfonyl]phenyl]azoxy]stilbene-2,2'-disulfonic acid tetrasodium salt; Stilbene-based optical brightener; Benzothiazole stilbene brightener; Tetrasodium 4,4'-bis[[4-[2-(6-methyl-2-benzothiazolyl)sulfonyl]phenyl]azoxy]stilbene-2,2'-disulfonate
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[4-(2-Benzothiazolyl-6-Methyl)Sulphonatophenyl]Azoxy]Stilbene-2,2'-Disulphonate adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color strength, and application performance. Certificates of Analysis (COA) detailing key parameters such as assay, hue, and solubility are provided to guarantee the product meets your specific technical 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 product is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
pH (1% Solution)	7.0 - 9.0
Ash Content	Contact for details

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