Description

Disodium 4,4'-Bis[(4-Methoxy-6-Phenoxy-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate is a high-performance fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene class. Its primary value lies in 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 critically needed in industries where optical brightness is a key quality parameter, such as paper manufacturing, detergent formulations, and synthetic fiber production. Its disulphonate groups provide excellent water solubility, making it particularly effective in aqueous application systems.

Application

• Paper and Pulp Industry: As a key additive in high-quality writing, printing, and tissue papers to achieve superior brightness and whiteness.
• Laundry Detergents and Fabric Care: Incorporated into powder and liquid detergents to impart a "whiter-than-white" appearance to textiles during washing.
• Textile and Synthetic Fibers: Used in the finishing of cotton, nylon, polyester, and polyamide fibers to enhance their visual appeal.
• Plastics and Polymers: Applied in the manufacture of plastics, especially those exposed to light, to mask inherent yellowness and improve aesthetic quality.
• Coatings and Paints: Utilized in specific coating formulations where optical brightening is required for a clean, bright finish.
• Advanced Material Synthesis: Serves as a functional intermediate or additive in specialty chemical synthesis requiring fluorescent properties.

Basic Information

Product Name	Disodium 4,4'-Bis[(4-Methoxy-6-Phenoxy-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate
CAS No.	3827-17-6
Molecular Formula	C40H30N10Na2O10S2
Molecular Weight	912.82 g/mol
Synonyms	Fluorescent Brightener 351; Tinopal CBS-X; 4,4'-Bis[(4-methoxy-6-phenoxy-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Disodium 4,4'-bis(4-methoxy-6-phenoxy-1,3,5-triazin-2-ylamino)stilbene-2,2'-disulfonate; FWA 351; CBS-X; Optical Brightener 351; 2,2'-(1,2-Ethenediyl)bis[5-[[4-methoxy-6-(phenoxy)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] disodium salt
EINECS	223-326-1

Quality Control

Our production of Disodium 4,4'-Bis[(4-Methoxy-6-Phenoxy-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing to ensure consistent purity, performance, and compliance with industry specifications. Key parameters such as active content, hue, and solubility are meticulously controlled. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and quality assurance 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 product is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept sealed when not in use to prevent moisture absorption and degradation. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light yellow to yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Freely soluble
Ash Content	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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