Description

Fluorescent Brightener 9 (CAS NO 133-66-4) is a high-performance stilbene-based optical brightening agent (OBA) designed to enhance the whiteness and brightness of various substrates. Its core value lies in its ability to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and creating a cleaner, more vibrant appearance. This product is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to improve the aesthetic quality and perceived value of their finished goods.

Application

• Textile Finishing: Widely used for whitening and brightening cotton, nylon, wool, and blended fabrics, providing excellent light fastness and wash durability.
• Paper Manufacturing: Applied in coating formulations and pulp to achieve high-brightness, blue-white paper grades for premium printing, writing, and packaging.
• Laundry Detergents & Fabric Softeners: A key additive in household and industrial detergents to impart a "whiter-than-white" look to laundered textiles.
• Plastics and Synthetic Fibers: Incorporated into polymers like PVC, polyolefins, and polyester to correct inherent yellowness and improve visual appeal in molded products and fibers.
• Soaps and Personal Care: Used in bar soaps, liquid soaps, and some cosmetic formulations to enhance product whiteness.
• Coatings and Paints: Employed in specific coating systems to increase brightness and opacity.

Basic Information

Product Name	Fluorescent Brightener 9
CAS No.	133-66-4
Molecular Formula	C₂₈H₂₀N₂O₂S₂
Molecular Weight	480.60 g/mol
Synonyms	4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; Tinopal UNPA-GX; Blankophor BSU; Fluorescent Brightener ER; Fluorescent Whitening Agent ER; Stilbene Brightener 9; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]; CI Fluorescent Brightener 71
EINECS	205-125-6

Quality Control

Our Fluorescent Brightener 9 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 checks for solubility and shade. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with each shipment to guarantee compliance with your technical requirements.

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 (Spectrophotometric)	100 ± 3%
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear, faint yellow 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.