Description

Tetrasodium 4,4'-Bis[[4-Chloro-6-[(3-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate is a high-performance, water-soluble fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene 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. Its tetrasodium salt form ensures excellent solubility and compatibility in aqueous formulations.

Application

• Textile Finishing: As a critical optical brightener for cotton, viscose, nylon, and wool, providing a brilliant white appearance and improving color vividness in fabrics.
• Laundry Detergent & Fabric Softeners: A key additive in premium powder and liquid detergents to impart a "whiter-than-white" look to laundered garments.
• Paper Manufacturing: Used in coating formulations and pulp to enhance the brightness and opacity of high-quality writing, printing, and tissue papers.
• Plastics and Synthetic Fibers: Incorporated into polymers like PVC, polyolefins, and polyester to correct inherent yellowness and improve aesthetic appeal.
• Soaps and Personal Care: Employed in bar soaps, shampoos, and other cleansing products to improve visual product quality.
• Advanced Coatings: Formulated into paints, varnishes, and other coating systems to achieve high whiteness and luminosity.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[4-Chloro-6-[(3-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	37138-25-3
Molecular Formula	C40H26Cl2N12Na4O14S4
Molecular Weight	1185.86 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal CBS-X; Stilbene Brightener 71; FWA 71; 4,4'-Bis[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid tetrasodium salt; CBS-X; Optical Brightener OB-71; Blankophor CBS-X
EINECS	253-357-1

Quality Control

Our production of Tetrasodium 4,4'-Bis[[4-Chloro-6-[(3-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Each batch undergoes comprehensive analytical testing, including HPLC for purity and assay, spectrophotometry for strength and shade, and checks for heavy metal content to ensure compliance with global industry and regulatory standards. Certificates of Analysis (COA) documenting all critical parameters are provided with every shipment to guarantee traceability and consistency for our B2B clients.

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); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance and handling properties.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Strength (Spectrophotometry)	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
pH (1% Aqueous Solution)	7.0 - 9.5
Water Solubility	Clear solution at 1%
Heavy Metals (as Pb)	≤ 20 ppm

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