Description

Tetrasodium 4,4'-Bis[[4-[Bis(2-Hydroxypropyl)Amino]-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 derivative class. It matters for 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, detergent, paper, and plastics industries seeking to achieve superior optical brightening effects in their final products. CAS No. 67786-25-8.

Application

This advanced fluorescent whitening agent is engineered for demanding applications where high whitening efficiency and substrate affinity are required.

• Textile Finishing: Primary application for whitening and brightening cotton, nylon, wool, and synthetic fibers during scouring, bleaching, or finishing stages.
• Laundry Detergents & Fabric Softeners: A key additive in premium powder and liquid detergents to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper Manufacturing: Used in coating formulations and pulp to enhance the brightness and quality of high-grade printing, writing, and tissue papers.
• Plastics and Polymers: Incorporated into polymers like PVC, polyolefins, and coatings to improve visual appeal and counteract inherent yellowness.
• Soaps and Personal Care: Employed in certain soap bars and cosmetic formulations to boost perceived cleanliness and brightness.
• Synthetic Fibers: Applied in the spin finish or dope for man-made fibers to provide inherent whiteness.

Basic Information

Item	Details
Product Name	Tetrasodium 4,4'-Bis[[4-[Bis(2-Hydroxypropyl)Amino]-6-[(4-Sulphonatophenyl)Amino]-1,3,5-Triazin-2-Yl]Amino]-Stilbene-2,2'-Disulphonate
CAS No.	67786-25-8
Molecular Formula	C52H60N16Na4O18S4
Molecular Weight	~1445.3 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; Blankophor DRS; 4,4'-Bis[[4-[bis(2-hydroxypropyl)amino]-6-[(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid tetrasodium salt; Stilbene triazine fluorescent whitening agent; FWA 220; Optical Brightener OB-3; CI Fluorescent Brightener 220
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 4,4'-Bis[[4-[Bis(2-Hydroxypropyl)Amino]-6-[(4-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, including HPLC for purity and assay, spectrophotometry for strength and shade, and checks for solubility and ionic content. Certificates of Analysis (COA) documenting all key parameters are provided to ensure traceability and compliance with your specifications 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 original container must be kept sealed to prevent absorption of atmospheric moisture which can affect performance.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Fluorescent Strength	100 ± 3% (vs. Standard)
Shade (UV-Vis)	Standard Blue-White
Water Content (KF)	≤ 5.0%
Solubility in Water	Clear, complete solution
pH (1% Solution)	7.0 - 9.0
Sulfated Ash	Contact for details

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