Description

Disodium 4,4'-Bis(2-Sulfostyryl)Biphenyl is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene derivative class. This compound is essential for enhancing the brightness and perceived whiteness of materials by absorbing ultraviolet light and re-emitting it as visible blue light. It is primarily needed by manufacturers in the detergent, paper, textile, and plastics industries seeking to improve the aesthetic appeal and marketability of their finished products.

Application

• Detergent & Laundry Care: A key optical brightener in laundry detergents, fabric softeners, and soaps to make white fabrics appear brighter and colors more vivid.
• Paper Manufacturing: Used as a brightening agent in high-quality writing, printing, and tissue papers to achieve a superior white finish.
• Textile & Fiber Treatment: Applied in the finishing process of synthetic fibers (like polyester and nylon) and cotton to compensate for yellowish tints.
• Plastics & Polymers: Incorporated into polymers, adhesives, and coatings to improve the whiteness and brightness of plastic products.
• Cosmetics & Personal Care: Employed in certain cosmetic formulations where a brightening or whitening effect is desired.
• Advanced Material Research: Serves as a functional material in research for organic light-emitting diodes (OLEDs) and fluorescent sensors due to its photoluminescent properties.

Basic Information

Product Name	Disodium 4,4'-Bis(2-Sulfostyryl)Biphenyl
CAS No.	27344-41-8
Molecular Formula	C28H18Na2O6S2
Molecular Weight	544.51 g/mol
Synonyms	Disodium 4,4'-Bis(2-sulfostyryl)biphenyl; Disodium 4,4'-Bis[(E)-2-(sulfonato)styryl]biphenyl; Fluorescent Brightener 351; Tinopal CBS-X; Blankophor BSU; FWA 351; 4,4'-Bis(2-sulfostyryl)biphenyl disodium salt; 2,2'-(1,1'-Biphenyl)-4,4'-diylbis[2-ethenylbenzenesulfonic acid] disodium salt
EINECS	Contact for details

Quality Control

Our Disodium 4,4'-Bis(2-Sulfostyryl)Biphenyl is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and solubility. Certificates of Analysis (COA) documenting key parameters such as assay, absorbance, and hue are available upon request to support your quality assurance protocols.

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 sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Absorbance (UV-Vis)	Conforms to standard
Solubility in Water	Freely soluble

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