Description

Hexasodium 4,4'-bis[[4-chloro-6-[[3-[[1-(2,5-dichloro-4-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-performance, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazine class. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby compensating for yellowing and significantly enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers seeking to achieve superior optical brightening effects in demanding applications. It is primarily needed by industries focused on producing high-quality papers, textiles, detergents, and plastics where visual appeal is a critical market differentiator.

Application

• Paper Manufacturing: Used as a key additive in the production of high-brightness printing and writing papers, tissue, and board to achieve superior whiteness.
• Textile Finishing: Applied in the finishing process of cotton, nylon, and other fibers to enhance whiteness and brightness, especially for white fabrics.
• Detergent & Laundry Care: Incorporated into premium laundry detergents and fabric softeners to impart a "whiter-than-white" appearance to laundered garments.
• Plastics and Polymers: Utilized as an optical brightener for synthetic fibers (like polyester and nylon) and various plastic materials to improve visual quality.
• Coating Formulations: Added to coatings and paints where a bright, clean white base or tint is required.
• Advanced Material Synthesis: Serves as a functional dye intermediate in the synthesis of specialized colorants and light-emitting materials.

Basic Information

Item	Details
Product Name	Hexasodium 4,4'-bis[[4-chloro-6-[[3-[[1-(2,5-dichloro-4-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.	70224-83-8
Molecular Formula	C₆₈H₃₂Cl₄N₁₆Na₆O₂₀S₆
Molecular Weight	~1831.6 g/mol (Contact for exact details)
Synonyms	Fluorescent Brightener 220; FWA 220; Tinopal CBS-X; Stilbene triazine fluorescent whitening agent; Hexasodium 2,2'-(1,2-ethenediyl)bis[5-[[4-chloro-6-[[3-[[1-(2,5-dichloro-4-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 220; 4,4'-Bis[[4-chloro-6-[(3-[(1-(2,5-dichloro-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo]-4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid hexasodium salt
EINECS	Contact for details

Quality Control

Our production of Fluorescent Whitening Agent 220 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. The product is manufactured under a quality system aligned with ISO 9001 standards. Key parameters such as purity, strength, hue, and solubility are rigorously tested using advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with each shipment to support your quality assurance and regulatory needs.

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 container must be kept tightly sealed after each use 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 Content	≤ 5.0%
Ash Content (Sulfated)	≤ 30.0%
pH (1% Solution)	7.0 - 9.5
Whiteness Degree (on standard substrate)	Conforms to reference standard
Solubility in Water	Freely soluble

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