Description

Fluorescent Brightener 378 is a high-performance optical brightening agent (OBA) designed to enhance the whiteness and brightness of synthetic materials. Its core value lies in its exceptional fluorescence efficiency and compatibility, providing a significant visual upgrade to finished products. This brightener is essential for manufacturers in the plastics, synthetic fibers, and coatings industries seeking to achieve superior aesthetic quality and market appeal for their goods.

Application

• Primary whitening and brightening agent for engineering plastics and thermoplastic polymers.
• Enhancing the optical properties of synthetic fibers, including polyester, nylon, and acrylics.
• Formulation additive for high-performance industrial and automotive coatings and paints.
• Use in masterbatch production for consistent and efficient dispersion in polymer processing.
• Brightening agent for various cast and molded plastic articles, films, and sheets.
• Potential applications in specialty inks and toners where optical brightness is required.

Basic Information

Product Name	Fluorescent Brightener 378
CAS No.	164908-53-6
Molecular Formula	C40H38N12O6S2
Molecular Weight	847.00 g/mol
Synonyms	2,2'-(1,2-Ethenediyl)bis[5-[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid; Fluorescent Brightener OB-1; OB-1; FB 378; 4,4'-Bis(2-sulfostyryl)biphenyl derivative; Optical Brightener 378; 2,2'-(1,2-Ethenediyl)bis(5-((4-(bis(2-hydroxyethyl)amino)-6-(phenylamino)-1,3,5-triazin-2-yl)amino)benzenesulfonic acid)
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 378 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with industry specifications. A Certificate of Analysis (COA) detailing key parameters such as assay, hue, and solubility is provided with each shipment to guarantee product integrity for your formulations.

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 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%
Loss on Drying	≤ 1.0%
Ash Content	≤ 0.5%
Fluorescence Intensity	≥ 95% of standard
Solubility	Practically insoluble in water; soluble in common organic solvents

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