Description

2-[4-[2-[4-[[2-Methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-2H-naphtho[1,2-d]triazole-5,8-disulfonic acid pentasodium salt is a high-purity, water-soluble fluorescent brightening agent (FBA) belonging to the complex stilbene-triazole chemical class. This compound is engineered to deliver exceptional optical performance by absorbing ultraviolet light and re-emitting it as visible blue light, thereby enhancing the perceived 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 through advanced whitening technology.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers, including cotton, polyester, and polyamide blends, in both batch and continuous processes.
• Paper Manufacturing: Used as an optical brightening agent (OBA) in high-quality writing, printing, and specialty papers to achieve high brightness and blue-white shade.
• Detergent & Laundry Care: A key ingredient in premium laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered fabrics.
• Plastics & Polymers: Incorporated into polymers like PVC, polyethylene, and polypropylene to correct yellowness and enhance the brightness of finished plastic products.
• Coatings & Paints: Employed in specific coating formulations to improve brightness and opacity, particularly in water-based systems.
• Advanced Material Synthesis: Serves as a functional intermediate or additive in the research and development of light-emitting materials and sensors.

Basic Information

Product Name	2-[4-[2-[4-[[2-Methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-2H-naphtho[1,2-d]triazole-5,8-disulfonic acid pentasodium salt
CAS No.	68631-09-4
Molecular Formula	C44H24N8Na5O18S6
Molecular Weight	Approx. 1290.0 g/mol
Synonyms	Fluorescent Brightener 220; FBA 220; Tinopal CBS-X; Blankophor BSU; Leucophor BSB; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[[2-methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]phenyl]sulfonyl]benzenesulfonic acid] pentasodium salt; 4,4'-Bis[[4-[[2-methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]phenyl]sulfonyl]stilbene-2,2'-disulfonic acid pentasodium salt; Optical Brightener OB-1 (related class).
EINECS	Contact for details

Quality Control

Our production of 2-[4-[2-[4-[[2-Methyl-4-(7-sulfo-2H-naphtho[1,2-d]triazol-2-yl)phenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-2H-naphtho[1,2-d]triazole-5,8-disulfonic acid pentasodium salt adheres to a stringent quality management system. Every batch is analyzed using advanced techniques like HPLC and spectrophotometry to ensure consistent purity, chromaticity, and performance. A comprehensive Certificate of Analysis (COA), detailing assay, impurity profile, and physical specifications, is provided with each shipment to guarantee it meets the exacting standards required for industrial and specialty chemical applications.

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 material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect performance and flow properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95.0%
Moisture Content	Max. 5.0%
pH (1% Solution)	7.0 - 9.0
Fluorescence Intensity	Compared to standard batch
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm

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