Description

Hexasodium 4,4'-bis[[4-chloro-6-[[3-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-sulphonatophenyl]amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulphonate is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazine class. It is engineered to provide exceptional optical brightening effects on cellulosic and polyamide fibers, significantly enhancing whiteness and brightness under UV light. This product is essential for manufacturers in the textile, paper, and detergent industries seeking to achieve superior product aesthetics and market competitiveness through advanced whitening technology.

Application

• Textile Finishing: Primary application for whitening cotton, viscose, and other cellulosic fabrics to achieve a brilliant white appearance.
• Paper Manufacturing: Used as an optical brightener in high-quality writing, printing, and specialty papers to improve brightness and opacity.
• Detergent & Laundry Care: Incorporated into premium laundry detergents and fabric softeners to impart a "whiter-than-white" look to laundered textiles.
• Polyamide Whitening: Effective for brightening nylon fibers and polyamide-based plastics.
• Industrial Coatings & Paints: Employed in specific coating formulations to mask yellowing and enhance perceived whiteness.
• Synthetic Fiber Production: Applied during the spinning or finishing processes of certain man-made fibers.

Basic Information

Item	Details
Product Name	Hexasodium 4,4'-bis[[4-chloro-6-[[3-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-sulphonatophenyl]amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulphonate
CAS No.	85959-11-1
Molecular Formula	C₆₈H₃₄Cl₄N₁₈Na₆O₂₀S₆
Molecular Weight	~1831.6 g/mol
Synonyms	Fluorescent Brightener 220 (FB 220); Tinopal CBS-X; Stilbene triazine fluorescent whitening agent; Hexasodium 2,2'-(1,2-ethenediyl)bis[5-[[4-chloro-6-[[3-[[1-(2-chloro-5-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-sulfophenyl]amino]-1,3,5-triazin-2-yl]amino]benzenesulfonate]; Optical Brightener OB-1 (for specific grades); 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid sodium salt (related compound); FWA 220; CBS-X
EINECS	Contact for details

Quality Control

Our hexasodium 4,4'-bis[[4-chloro-6-[[3-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-sulphonatophenyl]amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulphonate is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and assay, to ensure consistency and performance. Certificates of Analysis (COA) detailing purity, strength, and physical properties are available upon request to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent moisture absorption and caking. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95.0%
Moisture Content	Max. 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Freely soluble
Ash Content	Contact for details
Fluorescence Intensity	Compared to standard

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