Description

Fluorescent Brightener 263 is a high-performance stilbene-based optical brightening agent (OBA) designed to impart a brilliant white appearance to various substrates. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and enhancing perceived whiteness and brightness. This compound is essential for manufacturers in the plastics, synthetic fibers, and detergent industries seeking to improve the aesthetic appeal and marketability of their products. Its chemical stability and compatibility make it a reliable choice for demanding industrial applications.

Application

• Plastics and Polymers: Widely used in the whitening and brightening of polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and polystyrene (PS) for applications in films, sheets, and injection-molded articles.
• Synthetic Fibers: Effective for brightening polyester, nylon, and acetate fibers during melt spinning or in subsequent finishing baths to achieve high-quality, vibrant textiles.
• Detergent and Soap Industries: Incorporated into laundry detergents, fabric softeners, and soaps to provide a whitening effect on fabrics, making clothes appear cleaner and brighter.
• Paper Manufacturing: Used as a brightening agent in high-quality papers, including photographic papers and decorative boards, to achieve a high degree of whiteness.
• Coatings and Inks: Applied in formulations for paints, lacquers, and printing inks where optical brightening is required to enhance color clarity and visual impact.
• Advanced Material Processing: Suitable for use in masterbatch production, allowing for consistent and efficient dispersion of the brightener in final polymer products.

Basic Information

Product Name	Fluorescent Brightener 263
CAS No.	99549-42-5
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Fluorescent Brightener 263; FB 263; Optical Brightener 263; 2,2'-(1,2-Ethenediyl)bis[5-[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid disodium salt; 4,4'-Bis[[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid disodium salt; Tinopal UNPA; Blankophor BSU; Hostalux EBB
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 263 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and spectrophotometry for strength and hue, to ensure it meets precise industry specifications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with each shipment to guarantee consistent quality and batch-to-batch reliability for your production processes.

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 the container tightly sealed when not in use to minimize exposure to moisture and atmospheric contaminants.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Strength (Spectrophotometry)	100 ± 3%
Moisture Content	≤ 2.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear, yellow-green solution
pH (1% aqueous solution)	7.0 - 9.0

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