Description

Sodium 4-(2H-Naphtho[1,2-D]Triazol-2-Yl)Stilbene-2-Sulphonate is a high-purity, synthetic organic compound belonging to the stilbene derivative class, widely recognized as an optical brightening agent (OBA) or fluorescent whitening agent (FWA). Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the perceived whiteness and brightness of materials. This product is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to improve the aesthetic appeal and marketability of their finished goods.

Application

• Textile Finishing: As a key optical brightener for cotton, nylon, polyester, and blended fabrics to achieve high degrees of whiteness.
• Paper Manufacturing: Used in coating formulations and pulp to produce high-brightness printing, writing, and specialty papers.
• Detergent & Laundry Care: Incorporated into laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered textiles.
• Plastics and Polymers: Employed as an additive in the production of plastics, synthetic fibers, and films to correct yellowness and improve brightness.
• Cosmetics and Personal Care: Used in formulations where a brightening or whitening effect is desired, such as in certain creams and soaps.
• Coatings and Paints: Acts as a brightening agent in specific coating systems to enhance visual clarity and whiteness.

Basic Information

Product Name	Sodium 4-(2H-Naphtho[1,2-D]Triazol-2-Yl)Stilbene-2-Sulphonate
CAS No.	6416-68-8
Molecular Formula	C24H15N3NaO3S
Molecular Weight	448.45 g/mol
Synonyms	Tinopal CBS-X; Fluorescent Brightener 351; 2,2'-(1,2-Ethenediyl)bis[5-[[7-(sulfonatooxy)-2-naphthalenyl]azo]benzenesulfonic acid] tetrasodium salt; Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-[[7-(sulfonatooxy)-2-naphthalenyl]azo]-, tetrasodium salt; Sodium 4,4'-bis[[7-(sulfonatooxy)-2-naphthyl]azo]stilbene-2,2'-disulfonate; FWA 351; Optical Brightener OB-1; CI 40622
EINECS	229-149-7

Quality Control

Our Sodium 4-(2H-Naphtho[1,2-D]Triazol-2-Yl)Stilbene-2-Sulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, performance, and compliance with industry specifications for optical brightening agents. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee traceability and quality assurance for our global B2B clients.

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) and light-sensitive; prolonged exposure to moisture or direct light may affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Ash Content	≤ 0.5%
Fluorescence Intensity	≥ 95% of standard

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