Description

Fluorescent Brightener 28 is a high-performance stilbene-based optical brightening agent (OBA) designed to enhance the whiteness and brightness of various substrates. Its primary value lies in its ability to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and creating a visually brighter, cleaner appearance. This product is essential for manufacturers in the paper, textile, detergent, and plastics industries seeking to improve the aesthetic appeal and perceived quality of their finished goods.

Application

• Paper Manufacturing: Used in coatings and pulp to achieve high-brightness, blue-white papers for premium printing, writing, and packaging.
• Textile Finishing: Applied to cotton, nylon, and polyester fabrics to impart a brilliant white effect and improve color vividness.
• Laundry Detergents & Fabric Softeners: A key additive in powder and liquid formulations to make white fabrics appear whiter and colored fabrics look brighter after washing.
• Plastics and Synthetic Fibers: Incorporated into polymers like PVC, polyolefins, and polyester to correct yellowness and enhance the initial whiteness of molded parts and fibers.
• Soaps and Personal Care Products: Utilized in bar soaps, shampoos, and cosmetic formulations to improve visual appeal.
• Printing Inks and Coatings: Added to varnishes and specialty inks to create optical brightening effects on various surfaces.

Basic Information

Product Name	Fluorescent Brightener 28
CAS No.	4193-55-9
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Tinopal CBS-X; 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; Fluorescent Brightener CBS; Optical Brightener 28; FBA 28; Blankophor CBS; Leucophor CBS
EINECS	224-083-8

Quality Control

Our Fluorescent Brightener 28 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, strength, and performance. Key parameters such as active content, hue, and solubility are verified. A comprehensive Certificate of Analysis (COA) is provided with each shipment, detailing the results against our stringent internal standards to guarantee batch-to-batch consistency and reliability for your industrial processes.

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). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after initial opening to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture Content	≤ 2.0%
Ash Content	≤ 0.5%
pH (1% Solution)	7.0 - 9.0
Whiteness Degree	Standard sample comparison

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