Description

Hexasodium 2,2'-[p-Phenylenebis[Vinylene(3-Sulphonato-p-Phenylene)]]Bis[Naphtho[1,2-D]Triazole-6,8-Disulphonate] is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the bis(triazolyl)stilbene disulfonate class. This compound is engineered to deliver exceptional optical brightening performance 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 market competitiveness.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide during manufacturing or finishing processes.
• 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 treatment to achieve high brightness grades in printing, writing, and specialty papers.
• Plastics and Polymers: Incorporated into polymers such as PVC, polyethylene, and polystyrene to correct yellowness and improve the visual appeal of finished plastic products.
• Soaps and Personal Care: Employed in the production of bar soaps, liquid soaps, and certain cosmetic formulations to enhance perceived cleanliness and brightness.
• Synthetic Fibers Production: Added during the polymer spinning process for man-made fibers to ensure inherent whiteness from the production stage.

Basic Information

Product Name	Hexasodium 2,2'-[p-Phenylenebis[Vinylene(3-Sulphonato-p-Phenylene)]]Bis[Naphtho[1,2-D]Triazole-6,8-Disulphonate]
CAS No.	71033-16-4
Molecular Formula	C~40~H~18~N~6~Na~6~O~18~S~6
Molecular Weight	~1380.9 g/mol
Synonyms	Fluorescent Brightener 351; FWA 351; Tinopal CBS-X; Hexasodium 4,4'-bis[[4-[4,6-bis(sulfonatooxy)-1,3,5-triazin-2-yl]amino]-2-sulfonatostyryl]biphenyl-2,2'-disulfonate; 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bis[5-[4-[4,6-bis[(sulfooxy)amino]-1,3,5-triazin-2-yl]amino]-2-sulfobenzoic acid] hexasodium salt; Optical Brightener OB-351; Benzenesulfonic acid, 2,2'-(1,2-ethenediyldi-4,1-phenylene)bis[5-[[4-[4,6-bis[(sulfooxy)amino]-1,3,5-triazin-2-yl]amino]-2-sulfo-, hexasodium salt; CBS-X.
EINECS	Contact for details

Quality Control

Our production of Hexasodium 2,2'-[p-Phenylenebis[Vinylene(3-Sulphonato-p-Phenylene)]]Bis[Naphtho[1,2-D]Triazole-6,8-Disulphonate] adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed for critical parameters including purity, hue, and strength against established internal specifications. A comprehensive Certificate of Analysis (COA) detailing assay results, physical properties, and performance tests 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after initial use to prevent moisture absorption and caking. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.5
Whiteness Degree (on cotton)	Standard sample ± 5%
Solubility in Water	Clear, complete solution

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