Description

Fluorescent Brightener 357 is a high-performance stilbene-based optical brightening agent (OBA) designed to impart a brilliant white appearance to various substrates. This compound is critical for manufacturers seeking to enhance the perceived whiteness, brightness, and color vibrancy of their products under UV light. It is an essential additive for industries focused on superior visual quality and consumer appeal in textiles, plastics, and detergents.

Application

• Synthetic Fiber Whitening: Primary application for whitening and brightening polyester, nylon, and acetate fibers during melt spinning or finishing processes.
• Plastics and Polymer Masterbatch: Used in the production of engineering plastics, films, and injection-molded articles to counteract yellowing and improve aesthetic appeal.
• Detergent and Laundry Care Formulations: A key ingredient in premium laundry detergents and fabric softeners to provide a "whiter-than-white" effect on cotton and blended fabrics.
• Paper Coating and Filling: Enhances the brightness of high-quality printing and writing papers, improving opacity and print contrast.
• Textile Finishing and Printing: Applied in finishing baths or printing pastes for cellulosic and synthetic fabrics to achieve high-visibility effects.
• Advanced Coatings and Inks: Incorporated into specialty coatings and security inks to create optical effects and improve color fidelity.

Basic Information

Product Name	Fluorescent Brightener 357
CAS No.	41098-56-0
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	2,2'-(1,2-Ethenediyl)bis[5-[4-[bis(2-hydroxyethyl)amino]-6-(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]benzenesulfonic acid; Fluorescent Brightener ER; Tinopal ER; Blankophor ER; 4,4'-Bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; FBA 357; Optical Brightener 357; OBA 357
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 357 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for strength and hue, and tests for solubility and thermal stability. A Certificate of Analysis (COA) detailing all specifications is provided with each shipment to ensure traceability and compliance with your quality 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). Keep away from heat sources and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Strength (Spectrophotometry)	100 ± 3%
Hue	Standard
Moisture Content	≤ 1.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear solution
Particle Size (through 80 mesh)	≥ 95%

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