Description

Disodium 4,4'-Bis[[4,6-Bis[Bis(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is a high-performance fluorescent whitening agent (FWA) belonging to the stilbene-triazine derivative class. This compound is engineered to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and enhancing the perceived whiteness and brightness of materials. It is a critical additive for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects. Its disodium sulfonate groups ensure excellent water solubility and compatibility with various aqueous formulation processes.

Application

• Textile Finishing: Primary application for whitening and brightening cotton, linen, nylon, and wool fibers during scouring, bleaching, or finishing baths.
• Laundry Detergents & Fabric Softeners: Key ingredient 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 optical quality of high-grade printing, writing, and tissue papers.
• Plastics and Synthetic Fibers: Incorporated into polymers like PVC, polyolefins, and polyester to correct inherent yellowness and enhance visual appeal.
• Soaps and Personal Care Products: Employed in certain cosmetic and soap formulations where a brightening effect is desired.
• Advanced Coatings: Used in specialty paints, lacquers, and coatings where optical brightness is a required performance characteristic.

Basic Information

Item	Details
Product Name	Disodium 4,4'-Bis[[4,6-Bis[Bis(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	3654-78-2
Molecular Formula	C40H50N14Na2O14S2
Molecular Weight	1069.10 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal UNPA-GX; Blankophor BSU; Disodium 4,4'-bis(2-sulfonatostyryl)biphenyl derivative; Stilbene triazine fluorescent whitening agent; FWA 71; 4,4'-Bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Optical Brightener OB-1
EINECS	Contact for details

Quality Control

Our Disodium 4,4'-Bis[[4,6-Bis[Bis(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, performance, and batch-to-batch uniformity. Key parameters such as active content, hue, and solubility are verified. Certificates of Analysis (COA) documenting full specifications 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). Keep away from incompatible materials and direct heat sources. Due to its light-sensitive nature, prolonged exposure to direct sunlight or strong artificial light should be avoided to maintain product efficacy.

Specification

Item	Specification
Appearance	Light yellow to yellowish powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Ash Content	≤ 0.5%
Whiteness Degree	Standard sample comparison

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