Description

Hexasodium 3,3'-Azobis[7-(6-Sulphonato-2H-Naphtho[1,2-D]Triazol-2-Yl)Naphthalene-1,5-Disulphonate] is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the triazole-stilbene chemical class. This compound is engineered to provide exceptional optical brightening effects 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 component for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior product aesthetics and market competitiveness through advanced optical performance.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide in yarns, fabrics, and garments.
• Paper Manufacturing: Used in coating formulations and pulp to produce high-brightness printing papers, specialty papers, and board.
• Detergent & Laundry Care: A key ingredient in premium liquid and powder detergents, fabric softeners, and laundry boosters to impart a "whiter-than-white" appearance to laundered textiles.
• Plastics and Polymers: Incorporated into polymers such as PVC, polyolefins, and engineering plastics to correct yellowness and improve the visual appeal of finished plastic products.
• Cosmetics and Personal Care: Employed in formulations for soaps, shampoos, and other products where a bright, clean visual impression is desired.
• Advanced Coatings: Used in paints, varnishes, and other coating systems to enhance brightness and opacity.

Basic Information

Product Name	Hexasodium 3,3'-Azobis[7-(6-Sulphonato-2H-Naphtho[1,2-D]Triazol-2-Yl)Naphthalene-1,5-Disulphonate]
CAS No.	6508-68-5
Molecular Formula	C₄₀H₁₈N₁₂Na₆O₁₈S₆
Molecular Weight	1373.06 g/mol
Synonyms	Fluorescent Brightener 220; FB 220; Tinopal CBS-X; Hexasodium 4,4'-bis[[7-[[6-sulphonato-2H-naphtho[1,2-d]triazol-2-yl]amino]-1,3,6-naphthalenetrisulphonato]]stilbene; Stilbene triazole fluorescent whitening agent; Optical Brightener OB-1 (specific grade); 2,2'-(1,2-Ethenediyl)bis[5-[[7-[[(6-sulfo-2H-naphtho[1,2-d]triazol-2-yl)amino]-1,3,6-naphthalenetrisulfonic acid]], hexasodium salt
EINECS	Contact for details

Quality Control

Our production of Hexasodium 3,3'-Azobis[7-(6-Sulphonato-2H-Naphtho[1,2-D]Triazol-2-Yl)Naphthalene-1,5-Disulphonate] adheres to a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot undergoes comprehensive analysis, including HPLC for purity and isomer distribution, spectrophotometry for strength and hue, and tests for solubility and ionic content. Certificates of Analysis (COA) detailing all specifications are provided with every shipment. Our quality protocols are designed to meet the demanding standards of the global textile, paper, and detergent industries.

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 original container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials and heat sources.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.5
Water Solubility	Clear solution
Ash Content (Sulfated)	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm

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