Description

Disodium 4,4'-Bis[(6-Anilino-4-Chloro-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate is a high-performance fluorescent whitening agent (FWA) belonging to the stilbene-triazine class. It is valued for its exceptional ability to absorb UV light and re-emit it as visible blue light, thereby compensating for yellowish tints and enhancing the perceived whiteness and brightness of materials. This compound is a critical additive for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects. Its chemical structure provides excellent substantivity and light fastness on various substrates.

Application

• Textile Finishing: Primary application for whitening and brightening cotton, nylon, wool, and synthetic fibers during scouring, bleaching, or finishing processes.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-grade brightness in printing, writing, and specialty papers.
• Detergent & Laundry Care: Incorporated into laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered fabrics.
• Plastics and Polymers: Acts as an optical brightener for synthetic fibers (like polyester), plastics, and coatings to improve visual appeal.
• Soap and Personal Care: Employed in the production of bar soaps and certain cosmetic formulations to enhance whiteness.
• Advanced Material Coatings: Potential use in specialty coatings and films where UV protection and brightening are required.

Basic Information

Product Name	Disodium 4,4'-Bis[(6-Anilino-4-Chloro-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate
CAS No.	37138-23-1
Molecular Formula	C40H28Cl2N12Na2O6S2
Molecular Weight	933.72 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal UNPA-GX; Blankophor BSU; Disodium 4,4'-bis[(4-chloro-6-anilino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonate; 2,2'-(1,2-Ethenediyl)bis[5-[[4-chloro-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] disodium salt; FWA 71; CBS 71; Optical Brightener 71
EINECS	253-357-1

Quality Control

Our production of Disodium 4,4'-Bis[(6-Anilino-4-Chloro-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Key parameters such as purity, strength, hue, and solubility are rigorously tested using advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment 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). This material is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light yellow to yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture (Karl Fischer)	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Ash Content	≤ 0.5%
Whiteness Degree	Standard sample comparison
Heavy Metals (as Pb)	≤ 20 ppm

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