Description

Potassium Sodium 4,4'-Bis[[6-Anilino-4-[(2-Hydroxyethyl)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. Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as a bright blue fluorescence, effectively compensating for yellowing and enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the detergent, paper, textile, and plastics industries seeking to achieve superior optical brightening effects in their final products.

Application

This fluorescent whitening agent is engineered for high-efficiency performance across several key industrial sectors:

• Laundry Detergents & Fabric Softeners: As a key additive to impart a "whiter-than-white" appearance to textiles, compensating for fiber yellowing and improving visual appeal.
• Paper Manufacturing: Used in coating formulations and pulp to enhance the brightness and whiteness of high-quality printing, writing, and specialty papers.
• Textile & Fiber Treatment: Applied in finishing baths for cotton, nylon, and other fibers to improve whiteness, especially for materials that have been bleached.
• Plastics and Synthetic Fibers: Incorporated into polymer matrices (e.g., PVC, polyolefins) during processing to mask inherent yellowness and increase brightness.
• Soaps and Personal Care Cleansers: Utilized to improve the visual characteristics of bar soaps, liquid hand washes, and other cleansing products.
• Advanced Coatings: Formulated into paints, lacquers, and other coatings where optical brightening is required for specific aesthetic effects.

Basic Information

Item	Details
Product Name	Potassium Sodium 4,4'-Bis[[6-Anilino-4-[(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	85187-70-8
Molecular Formula	C40H34K2N14Na2O14S4
Molecular Weight	1193.26 g/mol
Synonyms	Fluorescent Brightener 351; 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 disodium dipotassium salt; FWA 351; Optical Brightener CBS-X; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-phenylamino-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] sodium potassium salt
EINECS	Contact for details

Quality Control

Our production of this fluorescent whitening agent adheres to stringent quality management protocols. Every batch is subjected to comprehensive analytical testing, including HPLC for purity and assay, spectrophotometry for strength and shade, and checks for solubility and heavy metal content. A detailed Certificate of Analysis (COA) is provided with each shipment, ensuring traceability and compliance with your specific application requirements and internal specifications.

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); the original 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	Light yellow to yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Strength (Spectrophotometry)	100 ± 3% of standard
Moisture Content (Karl Fischer)	≤ 5.0%
Solubility in Water	Clear, yellow solution
pH (1% Aqueous Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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