Description

Tetrasodium 4,4'-Bis[[4-Chloro-6-[(4-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 stilbene-triazine class. Its primary value lies in its exceptional ability to absorb ultraviolet 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 critically needed by manufacturers in the detergent, paper, textile, and plastics industries seeking to achieve superior optical brightening effects in their final products.

Application

This fluorescent whitening agent is engineered for high-affinity applications where brilliant whiteness is paramount. Key industrial uses include:

• Laundry Detergents & Fabric Softeners: As a core optical brightener to make white fabrics appear brighter and colors more vivid after washing.
• Paper & Pulp Manufacturing: For brightening high-quality writing, printing, and specialty papers to achieve a premium white appearance.
• Textile Finishing: Applied in the finishing bath for cotton, nylon, and other fibers to enhance whiteness, especially for materials that have been bleached.
• Synthetic Fibers & Plastics: Incorporated during the polymer extrusion or molding process to brighten polyamide, polyester, and PVC products.
• Soaps and Personal Care Cleansers: Used to improve the visual appeal of bar soaps and certain liquid cleansers.
• Coatings and Inks: To impart a brightening effect in specific coating formulations and printing inks.

Basic Information

Item	Detail
Product Name	Tetrasodium 4,4'-Bis[[4-Chloro-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	37138-26-4
Molecular Formula	C40H24Cl2N12Na4O14S4
Molecular Weight	1191.8 g/mol (approx.)
Synonyms	Fluorescent Brightener 71; Tinopal CBS-X; Blankophor BBH; 4,4'-Bis{[4-chloro-6-[(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino}stilbene-2,2'-disulfonic acid tetrasodium salt; FWA 71; Optical Brightener 71; Stilbene triazine fluorescent whitening agent; Tetrasodium 4,4'-bis(4-anilino-6-chloro-1,3,5-triazin-2-yl)aminostilbene-2,2'-disulfonate
EINECS	253-357-1

Quality Control

Our production of Tetrasodium 4,4'-Bis[[4-Chloro-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing to ensure consistent performance, including HPLC assay for purity, spectrophotometric analysis for strength and shade, and checks for solubility and ionic content. Certificates of Analysis (COA) detailing batch-specific results are provided to guarantee compliance with your technical specifications.

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

Specification

Item	Specification
Appearance	Light yellow to yellowish-green powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Strength (Spectrophotometry)	100 ± 3% of standard
Shade (Visual/Instrumental)	Conforms to standard
Water Content (Karl Fischer)	≤ 5.0%
Solubility (in Water)	Clear, yellow solution
pH (1% Aqueous Solution)	7.0 - 9.5
Ionic Content (Chloride, Sulfate)	Within limits

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