Description

Fluorescent Brightener 121 is a high-performance stilbene derivative optical brightening agent (OBA) designed to impart a brilliant white appearance to materials by absorbing ultraviolet light and re-emitting it as visible blue light. This compound is essential for manufacturers seeking to enhance the perceived brightness, whiteness, and visual appeal of their products, overcoming the natural yellowish tint of many substrates. It is a critical additive for industries including paper manufacturing, detergent formulations, textile finishing, and polymer processing where superior optical properties are a key quality differentiator.

Application

• Paper & Pulp Industry: Primary application for whitening and brightening high-quality writing, printing, and specialty papers.
• Laundry Detergents & Fabric Care: Key ingredient in powder and liquid detergents to make white fabrics appear brighter and colors more vivid after washing.
• Textile & Fiber Treatment: Used in the finishing process of synthetic fibers (like polyester and nylon) and cotton to achieve a permanent brightening effect.
• Plastics & Polymer Masterbatch: Incorporated into polymers such as PVC, polyolefins, and engineering plastics to improve the whiteness and luminosity of molded articles and films.
• Soaps & Personal Care: Added to bar soaps, shampoos, and other cleansing products to enhance their visual purity and appeal.
• Coatings & Inks: Utilized in specific coating formulations and printing inks to boost brightness and opacity.

Basic Information

Product Name	Fluorescent Brightener 121
CAS No.	12224-11-2
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Tinopal CBS-X; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Fluorescent Brightener CBS-X; Optical Brightener 121; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]benzenesulfonic acid disodium salt; Blankophor CBS-X; FWA 121; CI Fluorescent Brightener 121
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 121 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent performance, including HPLC assay for purity, spectrophotometric analysis for strength and hue, and tests for solubility and ash content. Certificates of Analysis (COA) detailing all specifications are available upon request to support your quality assurance and regulatory compliance needs.

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%
Strength (Spectrophotometry)	100 ± 3%
Water Content	≤ 5.0%
Ash Content	≤ 0.5%
pH (1% Solution)	7.0 - 9.0
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.