Description

Fluorescent Brightener 357 CAS NO 83512-97-4 is a high-performance stilbene-based optical brightening agent (OBA) designed to impart a brilliant white appearance to various substrates. Its primary value lies in its exceptional whitening and brightening efficacy, which enhances the perceived cleanliness, quality, and visual appeal of finished products. This agent is essential for manufacturers in the plastics, synthetic fibers, coatings, and detergent industries seeking to achieve superior whiteness and counteract yellowing.

Application

• Plastics and Polymers: Widely used in PVC, polyolefins (PP, PE), ABS, and engineering plastics to eliminate yellow tones and produce bright white or brilliantly colored articles.
• Synthetic Fibers: Effective in the spin-finish or masterbatch for polyester, nylon, and acrylic fibers to improve whiteness and brightness in textiles and non-wovens.
• Coatings and Paints: Incorporated into industrial and decorative coatings to enhance opacity and deliver a clean, bright white finish.
• Detergent and Soap Industries: Used in laundry detergents and fabric softeners as a key additive to make white fabrics appear whiter and brighter after washing.
• Paper Manufacturing: Applied in coating formulations for high-quality printing and writing papers to achieve a high degree of whiteness.
• Inks and Specialty Chemicals: Utilized in certain ink formulations and other chemical products where optical brightening is required.

Basic Information

Product Name	Fluorescent Brightener 357
CAS No.	83512-97-4
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Fluorescent Brightener 357; FB 357; Optical Brightener 357; 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; Tinopal UNPA-GX; Blankophor BSU; 4,4'-Bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 357 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 consistent performance and batch-to-batch uniformity. Certificates of Analysis (COA) documenting key specifications are available upon request to support your quality assurance protocols.

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 or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Strength (Spectrophotometry)	100 ± 3%
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear, faint yellow solution

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