Description

4,4'-Bis[[6-Anilino-4-[(2-Hydroxypropyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid is a high-performance, sulfonated stilbene-triazine derivative engineered for superior optical effects. This compound matters for its exceptional ability to absorb ultraviolet light and re-emit it as a bright, stable blue-white fluorescence, making it a critical component for achieving high whiteness and brightness. Industries requiring advanced optical brightening agents (OBAs) or fluorescent whitening agents (FWAs), such as paper manufacturing, detergent formulations, textile finishing, and plastics production, rely on this specific chemical for its efficacy and performance consistency.

Application

• Paper Manufacturing: As a key optical brightening agent (OBA) in high-quality printing, writing, and specialty papers to enhance brightness and whiteness.
• Detergent & Laundry Care: Incorporated into premium laundry detergents and fabric softeners to impart a "whiter-than-white" appearance to textiles.
• Textile & Fiber Processing: Used in the finishing of cotton, nylon, and other synthetic fibers to improve visual appeal and counteract yellowing.
• Plastics & Polymer Industry: Applied as a fluorescent whitening agent in polymers, coatings, and adhesives to improve aesthetic quality.
• Advanced Coatings & Inks: Utilized in formulations for high-visibility security papers, specialty coatings, and inks requiring optical enhancement.
• Cosmetic & Personal Care: Employed in select formulations where a brightening or whitening optical effect is desired.

Basic Information

Product Name	4,4'-Bis[[6-Anilino-4-[(2-Hydroxypropyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid
CAS No.	68134-08-7
Molecular Formula	C44H46N14O10S2
Molecular Weight	1011.06 g/mol
Synonyms	Fluorescent Brightener 351; Tinopal CBS-X; Stilbene Brightener 4B; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid (related compound); Distyrylbiphenyl derivative optical brightener; FWA 351; OBA for paper and detergents; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[(2-hydroxypropyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]
EINECS	Contact for details

Quality Control

Our 4,4'-Bis[[6-Anilino-4-[(2-Hydroxypropyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for assay and purity, spectrophotometry for strength and shade, and checks for moisture and sulfated ash. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided to ensure traceability and compliance with your application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to prevent degradation due to moisture absorption. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light yellow to yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Sulfated Ash	≤ 0.5%
Fluorescent Strength	98 - 102% (vs. Standard)
Shade	Standard Blue-White Fluorescence
Solubility (in Water)	Partially soluble, forms colloidal dispersion

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