Description

Tetrasodium 2-[4-[2-[4-[[2-methyl-4-(7-sulphonato-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]-2-sulphonatophenyl]vinyl]-3-sulphonatophenyl]-2H-naphtho[1,2-d]triazole-5-sulphonate is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazole chemical class. This compound is engineered to deliver 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 an essential component for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior product aesthetics and competitive market appeal.

Application

• Textile Finishing: Primary application for whitening and brightening cotton, nylon, polyester, and blended fabrics during manufacturing or laundering.
• Paper and Pulp Industry: Used in coating formulations and pulp to produce high-brightness printing, writing, and specialty papers.
• Detergent and Laundry Additives: A key ingredient in premium laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered garments.
• Plastics and Synthetic Fibers: Incorporated into polymer matrices (e.g., PVC, polyolefins) and synthetic fibers to correct yellowness and improve visual quality.
• Advanced Coatings and Paints: Employed in specific coating systems where optical brightness is required without compromising film properties.

Basic Information

Item	Details
Product Name	Tetrasodium 2-[4-[2-[4-[[2-methyl-4-(7-sulphonato-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]-2-sulphonatophenyl]vinyl]-3-sulphonatophenyl]-2H-naphtho[1,2-d]triazole-5-sulphonate
CAS No.	16596-97-7
Molecular Formula	C44H24N10Na4O16S4
Molecular Weight	Contact for details
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; FWA 220; 2,2'-(1,2-Ethenediyl)bis[5-[4-[2-[4-[[2-methyl-4-(7-sulphonato-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]phenyl]ethenyl]-3-sulphonatophenyl]-2H-naphtho[1,2-d]triazole-5-sulphonic acid, tetrasodium salt; C.I. Fluorescent Brightener 220; 4,4'-Bis[[4-[2-(4-sulfophenyl)ethenyl]-3-sulfophenyl]-2H-naphtho[1,2-d]triazol-2-yl]stilbene-2,2'-disulfonic acid, tetrasodium salt; Optical Brightener 220; Stilbene-triazole fluorescent whitener.
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 2-[4-[2-[4-[[2-methyl-4-(7-sulphonato-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]-2-sulphonatophenyl]vinyl]-3-sulphonatophenyl]-2H-naphtho[1,2-d]triazole-5-sulphonate adheres to a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, performance, and compliance with industry specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee traceability and 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Yellowish powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Water Solubility	Freely soluble
Ash Content	Contact for details

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