Description

Disodium 4,4'-Bis[[6-Anilino-4-(Ethylamino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate CAS NO 24565-13-7 is a high-performance fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene class. It matters for its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby compensating for yellowing and enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects in their products.

Application

• Textile Finishing: Primary application for whitening and brightening cotton, nylon, wool, and synthetic fibers during scouring, bleaching, or finishing processes.
• Laundry Detergents & Fabric Softeners: A key additive in household and industrial detergents to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper Manufacturing: Used in coating formulations and pulp to improve the brightness and quality of high-grade printing, writing, and tissue papers.
• Plastics and Synthetic Polymers: Incorporated into polymers like PVC, polyolefins, and styrenics to correct inherent yellowness and improve aesthetic appeal.
• Soaps and Personal Care Products: Employed in certain cosmetic and soap formulations to enhance visual purity and brightness.
• Advanced Coatings: Utilized in specialty paints and coatings where optical brightness is a critical performance parameter.

Basic Information

Product Name	Disodium 4,4'-Bis[[6-Anilino-4-(Ethylamino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	24565-13-7
Molecular Formula	C40H38N12Na2O6S2
Molecular Weight	908.90 g/mol
Synonyms	Fluorescent Brightener 220; FWA 220; Tinopal CBS-X; Stilbene Brightener 220; 4,4'-Bis[(4-anilino-6-ethylamino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Disodium 4,4'-bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonate (related variant); Optical Brightener OB-1 (common trade category)
EINECS	Contact for details

Quality Control

Our production of Disodium 4,4'-Bis[[6-Anilino-4-(Ethylamino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analysis to ensure consistent purity, chromaticity, and performance. Key parameters such as assay (HPLC), ash content, and whiteness index are verified against strict internal specifications. A Certificate of Analysis (COA) detailing these results is provided with each shipment to guarantee traceability and compliance.

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) and light-sensitive; prolonged exposure to moisture or direct light may affect performance and stability. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light yellow to yellow-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture (Karl Fischer)	≤ 5.0%
Sulfated Ash	≤ 0.5%
pH (1% Solution)	7.0 - 9.0
Whiteness Index (CIE)	Contact for details
Solubility in Water	Freely soluble

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