Description

Tetrasodium 3-[[2-Methyl-4-(7-Sulphonato-2H-Naphtho[1,2-D]Triazol-2-Yl)Phenyl]Azo]-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 di-styryl biphenyl (DSBP) derivative class. This compound is engineered to deliver exceptional optical brightening performance by absorbing ultraviolet light and re-emitting it as visible blue light, thereby compensating for yellowing and enhancing the perceived whiteness and brightness of materials. It is an essential component for manufacturers in the textiles, detergents, paper, and plastics industries who require reliable and efficient whitening solutions to meet stringent quality and aesthetic standards for their finished products.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide during manufacturing or laundering.
• Laundry Detergents and Fabric Softeners: A key additive in premium powder and liquid detergents to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper and Pulp Industry: Used in coating formulations and pulp treatment to achieve high brightness grades in printing, writing, and specialty papers.
• Plastics and Polymer Processing: Incorporated into polymers such as PVC, polyethylene, and polystyrene to correct inherent yellowness and improve visual appeal in molded products and films.
• Advanced Coatings and Inks: Enhances the brightness and clarity of paints, varnishes, and printing inks, particularly where optical effects are critical.
• Cosmetics and Personal Care: Employed in formulations like shampoos and soaps to improve the visual perception of purity and cleanliness.

Basic Information

Item	Details
Product Name	Tetrasodium 3-[[2-Methyl-4-(7-Sulphonato-2H-Naphtho[1,2-D]Triazol-2-Yl)Phenyl]Azo]-7-(6-Sulphonato-2H-Naphtho[1,2-D]Triazol-2-Yl)Naphthalene-1,5-Disulphonate
CAS No.	83784-01-4
Molecular Formula	C40H22N10Na4O14S4
Molecular Weight	1114.93 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; FWA 220; 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole, sulfonated derivative; 4,4'-Bis(2-sulfostyryl)biphenyl tetrasodium salt; Distyrylbiphenyl disulfonate derivative; Optical Brightener OB-1 (related class); Blankophor BSU (trade name variant)
EINECS	Contact for details

Quality Control

Our production of this fluorescent whitening agent adheres to rigorous quality control protocols to ensure batch-to-batch consistency, high purity, and optimal performance. Quality is verified through advanced analytical techniques including HPLC for assay and impurity profiling, UV-Vis spectroscopy for strength assessment, and pH measurement. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with every shipment to support your quality assurance and regulatory compliance needs.

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

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Ash Content (Sulfated)	≤ 20.0%
Fluorescent Strength	100 ± 5% (vs. Standard)
Solubility in Water	Clear, complete solution

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