Description

Fluorescent Brightener 33 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 exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and creating a brilliant, clean 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 products. Fluorescent Brightener 33 CAS NO 61902-19-0 offers excellent compatibility and stability under typical application conditions.

Application

Fluorescent Brightener 33 is a versatile whitening agent used across multiple industrial sectors. Its primary applications include:

• Paper Manufacturing: Whitening of high-quality writing, printing, and tissue papers to achieve superior brightness and opacity.
• Textile Finishing: Applied to cotton, nylon, and other synthetic fibers during washing or finishing to impart a bright, white look.
• Laundry Detergents & Fabric Softeners: A key additive in premium powder and liquid detergents to make white fabrics appear whiter and colors more vibrant.
• Plastics and Polymers: Incorporated into polymers like PVC, polyolefins, and styrenics to correct inherent yellowness and enhance the whiteness of finished products.
• Soaps and Personal Care: Used in bar soaps, shampoos, and other cleansing products to improve visual appeal.
• Coatings and Inks: Added to specific coatings and printing inks to achieve optical brightening effects on surfaces.

Basic Information

Product Name	Fluorescent Brightener 33
CAS No.	61902-19-0
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Fluorescent Brightener 33; FB 33; 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; Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]-, disodium salt; Optical Brightener 33; OBA 33
EINECS	263-529-1

Quality Control

Our Fluorescent Brightener 33 is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure consistent performance, including assay by HPLC, measurement of whitening effect, and checks for solubility and hue. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all relevant specifications. Our production adheres to ISO 9001 standards, and the product is compliant with global regulations such as REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat sources and incompatible materials. The product is light-sensitive (store away from light), as indicated in its chemical properties.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
Whiteness Degree (on standard fabric)	≥ 150 (or as agreed)
Solubility in Water	Clear, slightly opalescent 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.