Description

1,4-Benzenedisulfonic acid, 2,2'-[1,2-ethenediylbis[(3-sulfo-4,1-phenylene)imino[6- [(2-cyanoethyl)(2-hydroxypropyl)amino]-1,3,5-triazine-4,2-diyl]imino]bis-, hexasodium salt is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazine class. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the brightness and perceived whiteness of various substrates. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects in their finished products.

Application

This high-performance optical brightener is designed for demanding industrial applications where consistent and intense whitening is required.

• Textile Finishing: Primary application for whitening and brightening cotton, nylon, polyester, and blended fabrics.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-brightness paper grades for printing and writing.
• Laundry Detergents & Fabric Softeners: A key additive in premium detergent powders and liquids to impart a "whiter-than-white" appearance to laundered textiles.
• Plastics and Synthetic Fibers: Incorporated into polymers like PVC, polyolefins, and synthetic fibers during extrusion or molding to correct yellowness.
• Soaps and Personal Care Products: Used to enhance the visual appeal of bar soaps, liquid soaps, and certain cosmetic formulations.
• Advanced Coatings: Formulated into paints, varnishes, and other coatings to improve brightness and opacity.

Basic Information

Item	Details
Product Name	1,4-Benzenedisulfonic acid, 2,2'-[1,2-ethenediylbis[(3-sulfo-4,1-phenylene)imino[6- [(2-cyanoethyl)(2-hydroxypropyl)amino]-1,3,5-triazine-4,2-diyl]imino]bis-, hexasodium salt
CAS No.	76508-02-6
Molecular Formula	C₄₆H₄₂N₁₄Na₆O₁₈S₆
Molecular Weight	~1551.2 g/mol
Synonyms	Hexasodium 2,2'-(1,2-ethenediyldi-4,1-phenylene)bis[5-[4-[bis(2-cyanoethyl)amino]-6-[(2-hydroxypropyl)amino]-1,3,5-triazin-2-yl]amino]benzenesulfonate; Fluorescent Brightener 220; FWA 220; Optical Brightener OB-1 (specific grade); Tinopal CBS-X; Stilbene-triazine type brightener; 4,4'-Bis[[4-[bis(2-cyanoethyl)amino]-6-[(2-hydroxypropyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid hexasodium salt
EINECS	Contact for details

Quality Control

Our production of this optical brightener adheres to strict quality management systems to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed against stringent in-house specifications, which typically include parameters for identification, assay (active content), hue, and solubility. 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent moisture absorption, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture (Karl Fischer)	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Whiteness Degree (on standard fabric)	Conforms to customer requirement
Solubility in Water	Clear, yellow solution

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