Description

Benzenesulfonic Acid, 2,2'-(1,2-Ethenediyl)Bis[ 5-[[4-(2-Hydroxypropoxy)-6-(Phenylamino)-1,3,5-Triazin -2-Yl]Amino]-, Disodium Salt is a high-performance, water-soluble anionic fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene class. This compound is engineered to deliver exceptional optical brightening effects on cellulosic and polyamide fibers, enhancing whiteness and brightness under UV light. It is a critical specialty chemical for manufacturers in the textile, paper, and detergent industries seeking to improve the visual appeal and perceived cleanliness of their products.

Application

• Textile Finishing: Primary application for whitening and brightening cotton, viscose, and other cellulosic fabrics during scouring, bleaching, or finishing baths.
• Paper Manufacturing: Used in coating formulations and pulp treatment to achieve high-grade brightness in fine papers, tissue, and board.
• Detergent & Laundry Care: Incorporated into laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered textiles.
• Polyamide (Nylon) Processing: Effective brightener for synthetic fibers like nylon during polymer mass coloration or surface treatment.
• Industrial Coatings & Plastics: Can be utilized in specific polymer and coating systems where optical brightening is required.

Basic Information

Product Name	Benzenesulfonic Acid, 2,2'-(1,2-Ethenediyl)Bis[ 5-[[4-(2-Hydroxypropoxy)-6-(Phenylamino)-1,3,5-Triazin -2-Yl]Amino]-, Disodium Salt
CAS No.	68003-30-5
Molecular Formula	C46H42N12Na2O10S2
Molecular Weight	~1009.0 g/mol
Synonyms	Fluorescent Brightener 220 (FBA 220); Disodium 4,4'-bis[[4-(2-hydroxypropoxy)-6-(phenylamino)-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonate; Tinopal UNPA-GX; Blankophor DRS; C.I. Fluorescent Brightener 220; Optical Brightener OB-1 for cellulose; Stilbene triazine brightener; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt (related variant).
EINECS	Contact for details

Quality Control

Our production of this fluorescent whitening agent adheres to strict quality management systems. Every batch is subjected to rigorous analytical testing, including HPLC for purity and assay, spectrophotometry for strength and shade, and tests for solubility and ionic content. A comprehensive Certificate of Analysis (COA) detailing purity, absorbance, and physical specifications is provided with each shipment to ensure consistency and performance for your application.

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); keep the original container tightly sealed to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95.0%
Strength (Spectrophotometry)	100 ± 5% (vs. Standard)
Moisture Content	Max. 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Completely soluble
Ash Content	Max. 0.5%

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