Description

Hexasodium 4,4'-Bis[[2,6-Bis(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. This compound is engineered to absorb ultraviolet light and re-emit it as visible blue light, effectively compensating for yellowing and enhancing the perceived whiteness and brightness of materials. It is an essential additive for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects. The product, identified by CAS No. 33628-34-1, is supplied as a high-purity material suitable for demanding industrial applications.

Application

This advanced fluorescent whitening agent is designed for a wide range of industrial applications where brilliant whiteness and high lightfastness are critical. Its primary uses include:

• Textile Finishing: As a key component in laundry detergents, fabric softeners, and for the optical brightening of cotton, nylon, and other synthetic fibers during manufacturing.
• Paper Production: To enhance the brightness and whiteness of high-quality writing, printing, and tissue papers, providing a competitive visual appeal.
• Detergent & Soap Formulation: Incorporated into premium liquid and powder detergents to deliver a "whiter-than-white" appearance to laundered fabrics.
• Plastics and Polymers: Used in the manufacture of plastics, adhesives, and coatings to improve aesthetic quality and mask inherent yellowness.
• Advanced Material Coatings: Applied in specialty coatings and inks where optical properties and stability are paramount.

Basic Information

Product Name	Hexasodium 4,4'-Bis[[2,6-Bis(p-Sulphonatoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	33628-34-1
Molecular Formula	C52H30N12Na6O18S6
Molecular Weight	~ 1371.2 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; Hexasodium 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis[2,6-bis[(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]phenyl]sulfonyl]benzenesulfonate]; Stilbene Triazine FWA; Optical Brightener OB-1; 4,4'-Bis(2-sulfostyryl)biphenyl derivative; FBA 220
EINECS	Contact for details

Quality Control

Our production of Hexasodium 4,4'-Bis[[2,6-Bis(p-Sulphonatoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with industry specifications. Certificates of Analysis (COA) detailing key parameters such as assay, hue, and solubility are provided to guarantee product integrity and traceability for our global B2B clients.

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); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

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

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