Description

Tetrasodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Methylamino]-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 triazinylaminostilbene disulfonate class. Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as a bright blue fluorescence, thereby compensating for yellowish tints and 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, applied during bleaching or in finishing baths to achieve high degrees of whiteness.
• Detergent & Laundry Care: A key ingredient in premium liquid and powder detergents, fabric softeners, and laundry boosters to make white fabrics appear brighter and colors more vivid.
• Paper Manufacturing: Used in the coating and sizing of high-quality writing, printing, and tissue papers to improve brightness and opacity.
• Plastics & Synthetic Fibers: Incorporated into polymers like polyamide (nylon) and polyester during mass coloration to offset inherent yellowness and enhance visual appeal.
• Soap & Personal Care: Employed in bar soaps, shower gels, and cosmetic formulations where a clean, bright appearance is desired.
• Advanced Material Coatings: Utilized in specialty coatings and inks where fluorescent properties are required for security or aesthetic effects.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Methylamino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	74228-28-7
Molecular Formula	C46H44N14Na4O16S4
Molecular Weight	~1333.1 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; Blankophor BSU; FWA 220; 4,4'-Bis[[4-[(2-hydroxyethyl)methylamino]-6-[(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid tetrasodium salt; Distyrylbiphenyl derivative optical brightener; Stilbene triazine fluorescent whitening agent; CI Fluorescent Brightener 220
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Methylamino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including HPLC for purity and assay, spectrophotometry for strength and shade, and checks for insolubles and heavy metals. We provide comprehensive Certificates of Analysis (COA) with every shipment, detailing all specification parameters to ensure compliance with your application requirements and industry standards.

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 after each use to prevent absorption of atmospheric moisture, which can affect performance and flow characteristics.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Fluorescent Strength	100 ± 3% (vs. Standard)
Shade	Standard Blue Violet Fluorescence
Moisture (Karl Fischer)	≤ 5.0%
Water Solubility (1% Solution)	Clear to slightly opalescent
pH (1% Aqueous Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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