Description

Fluorescent Brightener 353 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 whitening and brightening efficacy, which enhances the perceived quality, cleanliness, and visual appeal of finished products. This additive is essential for manufacturers in the plastics, synthetic fibers, coatings, and detergent industries seeking to achieve superior optical properties and meet stringent market standards for whiteness.

Application

• Primary whitening agent for a wide range of thermoplastics, including PVC, PS, ABS, and polyolefins.
• Brightening of synthetic fibers such as polyester, nylon, and acetate during spin finish application or mass pigmentation.
• Formulation of high-performance industrial and architectural coatings, paints, and inks to mask yellowing and improve opacity.
• Key ingredient in laundry detergents and fabric softeners for compensating fiber yellowing and providing a "whiter-than-white" look.
• Enhancement of whiteness in paper and paperboard products, particularly in coating formulations.
• Use in adhesives and sealants to improve the brightness of the final cured product.

Basic Information

Product Name	Fluorescent Brightener 353
CAS No.	55585-28-9
Molecular Formula	C₄₀H₃₈N₁₂O₈S₂
Molecular Weight	878.96 g/mol
Synonyms	2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole; Fluorescent Brightener OB-1; Tinopal OB; Blankophor BSU; 4,4'-Bis(2-benzoxazolyl)stilbene; BBS; FBA 353; OB
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 353 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent performance, including assay (HPLC), identification (IR), and assessment of key physical properties. We provide full traceability and Certificates of Analysis (COA) are available upon request to verify compliance with your specifications.

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)	≥ 99.0%
Melting Point	358 - 362 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.2%
Absorbance (Ethanol)	Conforms
Fluorescence Intensity	≥ 100% of standard

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