Description

Disodium 4,4'-Bis[[6-Anilino-4-(Methylamino)-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. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as a bright blue fluorescence, effectively compensating for yellowish tints and enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the textile, paper, and detergent industries seeking to achieve superior optical brightening effects. The product is supplied under stringent quality control, with CAS No. 31900-04-6.

Application

This advanced fluorescent whitening agent is engineered for high-efficiency performance across several key industrial sectors:

• Textile Finishing: Primary application for whitening and brightening cotton, nylon, polyester, and blended fabrics during scouring, bleaching, or finishing processes.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-grade brightness in fine papers, art papers, and board.
• Detergent & Laundry Care: A key additive in laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered textiles.
• Plastics and Polymers: Incorporated into synthetic fibers (like polyester) during polymerization or as a masterbatch to correct inherent yellowness.
• Advanced Coatings: Utilized in specific high-performance coatings and inks where optical brightness is a critical parameter.

Basic Information

Product Name	Disodium 4,4'-Bis[[6-Anilino-4-(Methylamino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	31900-04-6
Molecular Formula	C40H34N12Na2O6S2
Molecular Weight	888.88 g/mol
Synonyms	Fluorescent Brightener 220; FWA 220; Tinopal CBS-X; 4,4'-Bis[(4-anilino-6-methylamino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Disodium 4,4'-bis[(4-anilino-6-methylamino-s-triazin-2-yl)amino]stilbene-2,2'-disulfonate; Stilbene triazine fluorescent whitening agent; Optical Brightener CBS-X; 2,2'-(1,2-Ethenediyl)bis[5-[[4-(methylamino)-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] disodium salt
EINECS	Contact for details

Quality Control

Our production of Disodium 4,4'-Bis[[6-Anilino-4-(Methylamino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to rigorous quality protocols to ensure batch-to-batch consistency and performance reliability. Quality is verified through comprehensive analytical testing including HPLC for purity, spectrophotometry for strength and shade, and checks for key physical parameters. Certificates of Analysis (COA) documenting purity, fluorescence intensity, and other critical specifications are available for every batch to support your quality assurance and regulatory 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light yellow to yellow powder
Identification (IR)	Conforms to standard
Purity (HPLC)	≥ 98.0%
Fluorescence Intensity	100 ± 5% (vs. Standard)
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Freely soluble

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