Description

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) and optical brightener. This compound is valued for its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the perceived whiteness and brightness of materials. It is a critical additive for manufacturers in the paper, detergent, textile, and plastics industries seeking to improve product aesthetics and performance. The product is supplied under stringent quality control to ensure batch-to-batch consistency for industrial applications.

Application

• Paper Manufacturing: As a key optical brightener in high-quality writing, printing, and specialty papers to achieve superior brightness and whiteness.
• Detergent & Laundry Care: Incorporated into premium laundry detergents and fabric softeners to make white fabrics appear brighter and colors more vivid.
• Textile & Fiber Processing: Used in the finishing of cotton, nylon, and other synthetic fibers to compensate for natural yellowness and enhance visual appeal.
• Plastics & Polymer Industry: Applied as a brightening agent for polymers, including PVC, polyolefins, and coatings, to improve initial color and counteract yellowing.
• Advanced Material Synthesis: Serves as a functional component in the research and development of light-emitting materials, sensors, and other photonic applications.

Basic Information

Item	Details
Product Name	Sodium 4,4'-Bis(4-Phenyl-2H-1,2,3-Triazol-2-Yl)Stilbene-2,2'-Disulphonate
CAS No.	85187-75-3
Molecular Formula	C34H22N6Na2O6S2
Molecular Weight	728.68 g/mol
Synonyms	4,4'-Bis(4-phenyl-2H-1,2,3-triazol-2-yl)stilbene-2,2'-disulfonic acid disodium salt; Fluorescent Brightener 351; FWA 351; CBS 351; Disodium 4,4'-bis(4-phenyl-1,2,3-triazol-2-yl)stilbene-2,2'-disulfonate; 2,2'-(1,2-Ethenediyl)bis[5-[4-phenyl-2H-1,2,3-triazol-2-yl]benzenesulfonic acid] disodium salt; Optical Brightener OB-351; Tinopal CBS-X
EINECS	Contact for details

Quality Control

Our Sodium 4,4'-Bis(4-Phenyl-2H-1,2,3-Triazol-2-Yl)Stilbene-2,2'-Disulphonate is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and spectrophotometry for fluorescence performance, to ensure it meets precise industry specifications. Certificates of Analysis (COA) documenting identity, assay, and impurity profiles are available upon request to 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). Due to its hygroscopic nature, the container must be kept tightly sealed to minimize exposure to atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to light yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Water Content	≤ 2.0%
pH (1% Solution)	7.0 - 9.0
Fluorescence Intensity	≥ 95% of reference standard
Heavy Metals (as Pb)	≤ 20 ppm

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