Description

Octasodium 2,2'-[1,4-Phenylenebis[Imino(6-Chloro-1,3,5-Triazine-4,2-Diyl)Imino(1-Hydroxy-3,6-Disulphonatonaphthalene-2,8-Diyl)Azo]]Bisnaphthalene-1,5-Disulphonate is a high-performance, water-soluble fluorescent whitening agent (FWA) belonging to the complex triazine-stilbene chemical class. This compound is engineered to provide exceptional optical brightening effects by absorbing ultraviolet light and re-emitting it as visible blue light, thereby enhancing the perceived whiteness and brightness of treated materials. It is a critical additive for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior product aesthetics and market competitiveness.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide in both batch and continuous processes.
• Laundry Detergents & Fabric Softeners: A key ingredient in premium powder and liquid detergents to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper Manufacturing: Used in coating formulations and pulp treatment to achieve high brightness levels in fine papers, tissue, and board.
• Plastics and Synthetic Fibers: Incorporated during polymer synthesis or masterbatch production to brighten plastics, films, and spun fibers, countering inherent yellowness.
• Soaps and Personal Care: Employed in certain cosmetic and soap formulations to enhance visual appeal.
• Advanced Coatings: Potential use in specialty paints and coatings where optical brightening properties are desired.

Basic Information

Item	Detail
Product Name	Octasodium 2,2'-[1,4-Phenylenebis[Imino(6-Chloro-1,3,5-Triazine-4,2-Diyl)Imino(1-Hydroxy-3,6-Disulphonatonaphthalene-2,8-Diyl)Azo]]Bisnaphthalene-1,5-Disulphonate
CAS No.	71002-20-5
Molecular Formula	C68H28Cl2N16Na8O28S8
Molecular Weight	~2091.2 g/mol (Disodium salt form)
Synonyms	Fluorescent Brightener 220; FWA 220; Tinopal CBS-X; Blankophor BSU; Benzenesulfonic acid, 2,2'-(1,4-phenylenebis[imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3,6-disulfo-2,7-naphthalenediyl)azo])bis-, octasodium salt; 4,4'-Bis[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid derivative; Optical Brightener 220; C.I. Fluorescent Brightener 220
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. Every lot is tested against comprehensive specifications, including strength (tinctorial power), hue, solubility, and purity. A Certificate of Analysis (COA) detailing these results is provided with each shipment to support your quality assurance and regulatory compliance needs.

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 material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Strength (Tinctorial Power)	100 ± 3% (vs. Standard)
Shade (UV-Vis)	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility (1% Solution)	Clear, no visible residue
pH (1% Aqueous Solution)	7.0 - 9.0
Ash Content	≤ 0.5%

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