Description

Tetrasodium 4,4'-Bis[[4-[(2-Cyanoethyl)(2-Hydroxyethyl)Amino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is a high-performance, water-soluble fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene class. It is engineered to deliver exceptional optical brightening effects on cellulosic and polyamide fibers, significantly enhancing the perceived whiteness and brightness of textiles under UV light. This product is essential for manufacturers in the textile, detergent, and paper industries seeking to achieve superior product aesthetics and meet stringent quality standards for whiteness.

Application

• Textile Finishing: Primary application for whitening cotton, viscose, and other cellulosic fibers during bleaching or finishing processes.
• Detergent Formulation: Key additive in laundry detergents and fabric softeners to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper Manufacturing: Used in the production of high-brightness papers, including fine writing paper and specialty boards.
• Polyamide Whitening: Effective for brightening nylon and other polyamide materials.
• Industrial Coatings & Plastics: Incorporated into coatings and certain plastic formulations where optical brightening is required.

Basic Information

Item	Detail
Product Name	Tetrasodium 4,4'-Bis[[4-[(2-Cyanoethyl)(2-Hydroxyethyl)Amino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	37515-76-7
Molecular Formula	C52H48N16Na4O14S4
Molecular Weight	1337.2 g/mol (approx.)
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; Blankophor BSU; 4,4'-Bis[[4-[(2-cyanoethyl)(2-hydroxyethyl)amino]-6-[(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid tetrasodium salt; Stilbene-based optical brightener; FWA 220; C.I. Fluorescent Brightener 220; Distyrylbiphenyl derivative
EINECS	Contact for details

Quality Control

Our production of this fluorescent whitening agent adheres to strict quality management systems. Every batch is analyzed to ensure consistent strength, hue, and application performance. Key parameters such as purity, shade, and solubility are verified. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory compliance needs.

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); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Clear solution
Ash Content	Contact for details
Heavy Metals (as Pb)	< 20 ppm

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