Description

Tetrasodium 4,4'-Bis[3-[3-Methyl-4-[(4-Sulphonatophenyl)Azo]Phenyl]Oxadiaziridinyl]Stilbene-2,2'-Disulphonate is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene derivative class. Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby 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 in their products.

Application

• Textile Finishing: As a key optical brightener for cotton, linen, viscose, and polyamide fibers to achieve high whiteness grades.
• Paper Manufacturing: Used in coating formulations and pulp to enhance the brightness and optical quality of high-grade writing, printing, 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: Applied in the production of plastics, synthetic fibers (like polyester), and coatings to correct yellowness and improve visual appeal.
• Advanced Material Coatings: Utilized in formulations for paints, inks, and other surface coatings where brightness and color correction are critical.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[3-[3-Methyl-4-[(4-Sulphonatophenyl)Azo]Phenyl]Oxadiaziridinyl]Stilbene-2,2'-Disulphonate
CAS No.	96873-61-9
Molecular Formula	C46H32N10Na4O16S4
Molecular Weight	~1192.0 g/mol
Synonyms	Fluorescent Brightener 220; FWA 220; Tinopal CBS-X; Stilbene-based Optical Brightener 220; 4,4'-Bis(1,2,3-triazol-2-yl)stilbene-2,2'-disulfonic acid tetrasodium salt (related structural description); Optical Brightening Agent OBA 220; Tetrasodium 4,4'-bis(2H-1,2,3-triazol-2-yl)stilbene-2,2'-disulfonate (common alternative naming); CI Fluorescent Brightener 220
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[3-[3-Methyl-4-[(4-Sulphonatophenyl)Azo]Phenyl]Oxadiaziridinyl]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed for critical parameters including purity, hue, and strength. Certificates of Analysis (COA) documenting these results are provided with every shipment. Our quality system is designed to meet the demands of global supply, supporting compliance with relevant industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the original container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture (Karl Fischer)	≤ 5.0%
pH (1% Solution)	7.0 - 9.5
Ash Content	≤ 20.0%
Whiteness Degree (on standard fabric)	To be specified per grade

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