Description

Tetrasodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Methylamino]-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 stilbene-triazine class. Its primary value lies in its exceptional ability to absorb UV light and re-emit it as visible blue light, thereby enhancing the perceived whiteness and brightness of treated materials. This compound is essential for manufacturers in the detergent, paper, and textile industries seeking to achieve superior optical brightening effects in their final products.

Application

• Detergent & Laundry Care: A key optical brightener in laundry detergents, fabric softeners, and soaps to make white fabrics appear brighter and colors more vivid.
• Paper Manufacturing: Used in coating formulations and pulp to improve the whiteness and brightness of high-quality writing, printing, and packaging papers.
• Textile Finishing: Applied in the finishing bath for cotton, nylon, and other fibers to compensate for yellowish tints and achieve a brilliant white appearance.
• Synthetic Fibers: Incorporated during the polymer spinning process for man-made fibers like polyamide and polyester to impart inherent whiteness.
• Plastics & Polymers: Acts as a whitening agent for certain thermoplastics to offset natural yellowness and improve aesthetic appeal.
• Advanced Coatings: Utilized in specialty coatings and paints where optical brightening properties are required.

Basic Information

Product Name	Tetrasodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Methylamino]-6-[(3-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	68413-51-4
Molecular Formula	C46H44N14Na4O16S4
Molecular Weight	1245.2 g/mol (approx.)
Synonyms	Fluorescent Brightener 351; Tinopal CBS-X; Stilbene triazine fluorescent whitening agent; 4,4'-Bis[[4-[(2-hydroxyethyl)methylamino]-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid tetrasodium salt; FWA 351; Optical Brightener OB-351; Distyrylbiphenyl derivative brightener; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[(2-hydroxyethyl)methylamino]-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[4-[(2-Hydroxyethyl)Methylamino]-6-[(3-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with industry specifications. Certificates of Analysis (COA) detailing key parameters such as assay, hue, and solubility are available upon request.

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 and caking.

Specification

Item	Specification
Appearance	Yellowish to light yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Freely soluble
Ash Content	≤ 15.0%

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