Description

Tetrasodium 2,2'-[Vinylenebis(3-Sulphonato-4,1-Phenylene)]Bis[2H-Naphtho[1,2-D]Triazole-7-Sulphonate] is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the bis(triazolyl)stilbene disulfonate 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 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 performance.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide during scouring, bleaching, or finishing baths.
• Laundry Detergents & Fabric Softeners: Key ingredient in premium liquid and powder detergents to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper Manufacturing: Used in coating formulations and pulp to improve the brightness and opacity of high-quality writing, printing, and packaging papers.
• Plastics and Synthetic Fibers: Incorporated into polymer matrices (e.g., PVC, polystyrene, polyolefins) and synthetic fiber spins to correct yellowness and enhance visual appeal.
• Soaps and Personal Care: Employed in certain cosmetic and soap formulations where a brightening effect is desired.
• Advanced Coatings: Utilized in specialty paints, lacquers, and coatings to improve luminosity and counteract yellowing.

Basic Information

Product Name	Tetrasodium 2,2'-[Vinylenebis(3-Sulphonato-4,1-Phenylene)]Bis[2H-Naphtho[1,2-D]Triazole-7-Sulphonate]
CAS No.	34087-70-2
Molecular Formula	C~40~H~22~N~6~Na~4~O~14~S~4
Molecular Weight	1050.87 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; 4,4'-Bis(2-sulfostyryl)biphenyl disodium salt derivative; 2,2'-(1,2-Ethenediyl)bis[5-[7-(sulfooxy)-2H-naphtho[1,2-d]triazol-2-yl]benzenesulfonic acid], tetrasodium salt; FWA 220; Optical Brightener OB-1 (specific grade); C.I. Fluorescent Brightener 220; 1,1'-Biphenyl, 4,4'-bis(2-sulfostyryl)-, disodium salt, fluorescent derivative
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 2,2'-[Vinylenebis(3-Sulphonato-4,1-Phenylene)]Bis[2H-Naphtho[1,2-D]Triazole-7-Sulphonate] adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is characterized using advanced analytical techniques including HPLC, UV-Vis spectroscopy, and titration to verify critical parameters such as active content, hue, and solubility. Certificates of Analysis (COA) documenting purity, strength, and physical properties are provided with each shipment. We support compliance with relevant global standards for industrial chemicals.

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 original container must be kept tightly sealed after use to prevent absorption of atmospheric moisture, which can affect performance and flow characteristics. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.5
Water Solubility	Completely soluble
Ash Content (Sulfated)	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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