Description

Potassium Sodium 4,4'-Bis(4-Phenyl-2H-1,2,3-Triazol-2-Yl)Stilbene-2,2'-Disulphonate is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazole class. This compound is valued for its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the brightness and whiteness of treated materials. It is a critical component for manufacturers in the detergent, paper, textile, and plastics industries seeking to achieve superior optical brightening effects in their products.

Application

• Detergent & Laundry Care: Primary application as an optical brightener in laundry detergents, fabric softeners, and soaps to make white fabrics appear brighter and colors more vivid.
• Paper Manufacturing: Used in the production of high-quality writing, printing, and packaging papers to improve brightness and opacity, reducing the need for expensive white pigments.
• Textile & Fiber Treatment: Applied in the finishing of cotton, nylon, and other synthetic fibers to compensate for yellowish tints and enhance perceived whiteness.
• Plastics & Polymers: Incorporated into polymers like PVC, polyolefins, and coatings to counteract yellowing and improve the visual appeal of finished plastic articles.
• Cosmetics & Personal Care: Utilized in certain cosmetic formulations, such as shampoos and conditioners, to impart a brightening effect.
• Advanced Materials: Investigated for use in fluorescent sensors, security inks, and other specialty applications due to its distinct photophysical properties.

Basic Information

Product Name	Potassium Sodium 4,4'-Bis(4-Phenyl-2H-1,2,3-Triazol-2-Yl)Stilbene-2,2'-Disulphonate
CAS No.	68057-99-8
Molecular Formula	C38H24K2N10Na2O6S2
Molecular Weight	928.99 g/mol
Synonyms	4,4'-Bis(4-phenyl-2H-1,2,3-triazol-2-yl)-2,2'-stilbenedisulfonic acid dipotassium disodium salt; Fluorescent Brightener 351; FWA 351; CBS 351; Tinopal CBS-X; Stilbene triazole-based optical brightener; Potassium sodium stilbene triazole disulfonate; 2,2'-(1,2-Ethenediyl)bis[5-[4-phenyl-2H-1,2,3-triazol-2-yl]benzenesulfonic acid] dipotassium disodium salt
EINECS	Contact for details

Quality Control

Our production of this optical brightener adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for strength and hue, and tests for solubility and heavy metals. A Certificate of Analysis (COA) detailing all specifications is provided with each shipment to ensure traceability and compliance with your formulation requirements.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Fluorescent Strength	100 ± 5% (vs. Standard)
Moisture (KF)	≤ 5.0%
Solubility in Water	Clear, yellow solution
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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