Description

Fluorescent Brightener 378 is a high-performance stilbene derivative optical brightening agent (OBA) used to enhance the whiteness and brightness of materials. Its core value lies in its exceptional fluorescence efficiency and affinity for synthetic polymers, providing a brilliant blue-white effect under UV light. This product is essential for manufacturers in the plastics, synthetic fibers, coatings, and detergent industries seeking to improve the visual appeal and perceived quality of their finished products.

Application

• Primary whitening agent for a wide range of thermoplastics, including polypropylene (PP), polyethylene (PE), ABS, and PVC.
• Brightening of synthetic fibers such as polyester, nylon, and acrylics during melt spinning or in spin finishes.
• Formulation additive in industrial and automotive coatings, paints, and inks to achieve high whiteness and mask yellowing.
• Key ingredient in laundry detergent and fabric softener formulations for textile care.
• Processing aid in the production of masterbatches and concentrates for consistent and easy dispersion in polymer matrices.
• Enhancement of brightness in paper and packaging materials, particularly for high-value grades.
• Used in the manufacture of photographic papers and certain specialty films.

Basic Information

Product Name	Fluorescent Brightener 378
CAS No.	40470-68-6
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 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; FB 378; Optical Brightener 378; OBA 378; Fluorescent Whitening Agent 378; FWA 378; Tinopal® CBS-X; Blankophor® BBH
EINECS	254-933-5

Quality Control

Our Fluorescent Brightener 378 is manufactured under a strict quality management system. Every batch undergoes rigorous testing to ensure consistent performance in key parameters such as hue, strength, and solubility. A comprehensive Certificate of Analysis (COA) detailing purity, absorbance, and physical properties is provided with each shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the original container tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Absorbance (348 nm)	≥ 0.95 (1% solution)
Moisture (KF)	≤ 2.0%
Ash Content	≤ 0.5%
Solubility (in DMF)	Clear solution

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