Description

Dipotassium Disodium 4,4'-Bis[[4-[(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 stilbene-triazine class. This compound is engineered to deliver exceptional optical brightening effects by absorbing ultraviolet light and re-emitting it as visible blue light, thereby enhancing the perceived whiteness and brightness of treated materials. It is a critical raw material for manufacturers in the textile, paper, detergent, and plastics industries seeking to improve the aesthetic appeal and market value of their finished products.

Application

This advanced fluorescent whitening agent is designed for a wide range of industrial applications where superior whitening and brightening are required.

• Textile Finishing: Primary application for whitening cotton, viscose, nylon, and wool fibers during scouring, bleaching, or finishing baths.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-brightness, blue-white shades in fine papers, tissues, and board.
• Laundry Detergents & Fabric Softeners: A key ingredient in premium powder and liquid detergents to impart a "whiter-than-white" appearance to laundered fabrics.
• Synthetic Fibers & Plastics: Incorporated into the polymer mass or applied as a surface treatment for polyamide, polyester, and PVC to counteract yellowing.
• Soaps & Personal Care: Used in bar soaps, liquid hand washes, and cosmetic formulations to enhance product whiteness.
• Coatings & Paints: Added to clear coatings and white paints to improve optical brightness and mask inherent substrate yellowness.

Basic Information

Item	Details
Product Name	Dipotassium Disodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Amino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	67828-25-5
Molecular Formula	C52H44K2N14Na2O16S4
Molecular Weight	1387.39 g/mol
Synonyms	Fluorescent Brightener 220 (FB 220); Tinopal CBS-X; Stilbene-triazine fluorescent whitening agent; 4,4'-Bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid dipotassium disodium salt; Disodium 4,4'-bis[[4-[(2-hydroxyethyl)amino]-6-[(4-sulfonatophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonate dipotassium salt; Optical Brightener OB-1 (industry-specific); FWA 220; CBS-X
EINECS	Contact for details

Quality Control

Our production of Dipotassium Disodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Amino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch is analyzed to ensure consistent purity, color strength, and application performance. Certificates of Analysis (COA) documenting key parameters such as assay, hue, and solubility are provided and can be tailored to meet specific customer requirements.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive) and light-sensitive; therefore, it must be stored in a cool, dry place at a controlled room temperature (15-25°C). Keep the container tightly sealed when not in use to prevent moisture absorption and degradation.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Hue	Standardized blue shade
Moisture (Karl Fischer)	≤ 5.0%
Water Solubility (1% Solution)	Clear, yellowish solution
pH (1% Aqueous Solution)	7.0 - 9.0
Ash Content	≤ 0.5%

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