Description

Disodium 4,4'-Bis[[4-[Bis(2-Hydroxyethyl)Amino]-6-Chloro-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is a high-performance fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene disulfonate class. Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby compensating for yellowing and significantly enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects on cellulose-based and synthetic substrates.

Application

• Textile Finishing: As a key optical brightener for cotton, viscose, and other cellulosic fibers during washing, bleaching, or finishing processes.
• Paper Manufacturing: To improve the whiteness and brightness of high-quality writing, printing, and tissue papers.
• Laundry Detergents & Fabric Softeners: Incorporated into powder and liquid detergent formulations to impart a "whiter-than-white" appearance to laundered fabrics.
• Plastics and Synthetic Fibers: For whitening and brightening applications in polymers such as polyamide (nylon) and other synthetics.
• Soaps and Personal Care Products: Used to enhance the visual appeal of bar soaps and certain cosmetic formulations.
• Coatings and Paints: As an additive to improve the brightness and opacity of specific coating systems.

Basic Information

Product Name	Disodium 4,4'-Bis[[4-[Bis(2-Hydroxyethyl)Amino]-6-Chloro-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	4028-32-4
Molecular Formula	C34H38Cl2N12Na2O10S2
Molecular Weight	924.75 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal UNPA-GX; Blankophor BSU; Disodium 4,4'-bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonate; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt (related); FWA 71; Optical Brightener OB-1 (industry specific); CI Fluorescent Brightener 220
EINECS	223-713-7

Quality Control

Our production of Disodium 4,4'-Bis[[4-[Bis(2-Hydroxyethyl)Amino]-6-Chloro-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and assay, spectrophotometry for strength and shade, and checks for moisture content and solubility. We ensure compliance with relevant industry and safety standards. A detailed Certificate of Analysis (COA) is provided with each shipment to guarantee batch-to-batch consistency and performance.

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 product is hygroscopic (moisture-sensitive) and light-sensitive; prolonged exposure to moisture or direct light should be avoided to maintain stability and efficacy. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Fluorescent Strength	100 ± 5% (vs. Standard)
Ash Content	≤ 0.5%
Solubility in Water	Clear solution

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