Description

Tetrasodium 4,4'-Bis[[4-Anilino-6-(p-Sulphonatoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is a high-performance, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazine class. It is engineered to deliver exceptional optical brightening effects on cellulosic and polyamide fibers, significantly enhancing whiteness and brightness under UV light. This product is essential for manufacturers in the textile, paper, and detergent industries seeking to improve the visual appeal and perceived quality of their finished goods.

Application

• Textile Finishing: Primary application for whitening cotton, viscose, and other cellulosic fabrics during bleaching or finishing processes.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-grade brightness in fine papers, tissues, and board.
• Detergent & Laundry Care: Incorporated into premium laundry detergents and fabric softeners to impart a "whiter-than-white" appearance to laundered textiles.
• Polyamide Whitening: Effective for brightening nylon fibers and plastics, enhancing their color in various synthetic applications.
• Industrial Coatings: Utilized in specific coating systems where optical brightening properties are required.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[4-Anilino-6-(p-Sulphonatoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	34233-64-2
Molecular Formula	C52H36N14Na4O14S4
Molecular Weight	1333.2 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; FWA 220; Stilbene Triazine FWA; 4,4'-Bis[(4-anilino-6-(N-ethyl-3-methylanilino)-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid tetrasodium salt; Optical Brightener OB-1 (for paper); Paper Brightener CBS; Blankophor BSU liq.
EINECS	Contact for details

Quality Control

Our Tetrasodium 4,4'-Bis[[4-Anilino-6-(p-Sulphonatoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure consistent performance, including purity (assay), shade, and solubility verification. Certificates of Analysis (COA) documenting key parameters are available upon request 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 room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent absorption of atmospheric moisture which may affect performance.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Completely soluble
Ash Content	≤ 15.0%

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