Description

Tetrasodium 2-[4-[[4-[2-(4-Nitro-2-Sulphonatophenyl)Vinyl]-3-Sulphonatophenyl]Azo]Phenyl]Naphtho[1,2-D]Triazole-6,8-Disulphonate is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the triazole-stilbene chemical class. This compound is engineered to deliver 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 performance additive for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior product aesthetics and market competitiveness.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide during manufacturing or finishing processes.
• Laundry Detergent Formulation: A key optical brightener in premium powder and liquid detergents to make white fabrics appear brighter and colors more vivid after washing.
• Paper Manufacturing: Used in the production of high-quality writing, printing, and specialty papers to achieve a high degree of whiteness and opacity.
• Plastics and Polymer Processing: Incorporated into polymers, synthetic fibers (like polyamide and polyester chips), and coatings to counteract yellowing and improve visual appeal.
• Soap and Personal Care Products: Employed in certain soap bars and cosmetic formulations where a whitening effect is desired.
• Advanced Material Coatings: Potential use in specialty coatings and inks where fluorescence and brightness are required for functional or aesthetic purposes.

Basic Information

Item	Details
Product Name	Tetrasodium 2-[4-[[4-[2-(4-Nitro-2-Sulphonatophenyl)Vinyl]-3-Sulphonatophenyl]Azo]Phenyl]Naphtho[1,2-D]Triazole-6,8-Disulphonate
CAS No.	71566-42-2
Molecular Formula	C39H22N6Na4O16S4
Molecular Weight	1046.85 g/mol (approx.)
Synonyms	Fluorescent Brightener 220 (FB 220); Tinopal CBS-X; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[4,5-dihydro-6-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-3-yl]phenyl]azo]benzenesulfonic acid] tetrasodium salt (related isomer); Optical Brightener OB-1 (generic); 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid derivative; Triazole-stilbene fluorescent whitening agent; FWA 220; Tetrasodium 4,4'-bis(2-sulfostyryl)biphenyl (common class name reference).
EINECS	Contact for details

Quality Control

Our production of Tetrasodium 2-[4-[[4-[2-(4-Nitro-2-Sulphonatophenyl)Vinyl]-3-Sulphonatophenyl]Azo]Phenyl]Naphtho[1,2-D]Triazole-6,8-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot undergoes comprehensive analysis, including HPLC for purity and isomer distribution, spectrophotometry for strength and shade, and tests for solubility and ionic content. A detailed Certificate of Analysis (COA) documenting these results is provided with each 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). This material is hygroscopic (moisture-sensitive); the original container must be kept tightly sealed after use to prevent absorption of atmospheric moisture, which can affect performance and flow characteristics. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
pH (1% Solution)	7.0 - 9.5
Water Solubility	Completely soluble
Ash Content (Sulfated)	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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