Description

Disodium 2-[4-Styryl-3-Sulphonatophenyl]-2H-Naphtho[1,2-D]Triazole-7-Sulphonate is a high-purity, water-soluble fluorescent whitening agent (FWA) belonging to the stilbene-triazole 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 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 appeal.

Application

• Textile Finishing: Primary application for whitening and brightening natural and synthetic fibers like cotton, polyester, and polyamide during manufacturing or finishing processes.
• Laundry Detergents & Fabric Softeners: Incorporated as a key optical brightener to compensate for yellowing and maintain fabric whiteness over repeated wash cycles.
• Paper & Pulp Industry: Used in high-quality paper production, including writing, printing, and tissue papers, to achieve a brilliant white appearance and improve opacity.
• Plastics and Synthetic Polymers: Applied in the manufacture of plastics, adhesives, and coatings to correct inherent yellowness and enhance visual appeal.
• Soaps and Personal Care Products: Utilized in certain soap formulations and cosmetic products where a whitening effect is desired.

Basic Information

Product Name	Disodium 2-[4-Styryl-3-Sulphonatophenyl]-2H-Naphtho[1,2-D]Triazole-7-Sulphonate
CAS No.	2583-80-4
Molecular Formula	C26H16N3Na2O7S2
Molecular Weight	600.53 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; 2,2'-(1,2-Ethenediyl)bis[5-[4-(sodiooxy)-3-sulfophenyl]-2H-benzotriazole] Disodium Salt; 4,4'-Bis[[4-(sodiooxy)-3-sulfophenyl]-2H-1,2,3-triazol-2-yl]stilbene-2,2'-disulfonate Disodium Salt; FWA 220; CBS-X; Optical Brightener 220; Blankophor ER
EINECS	219-967-7

Quality Control

Our Disodium 2-[4-Styryl-3-Sulphonatophenyl]-2H-Naphtho[1,2-D]Triazole-7-Sulphonate is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Quality is verified through comprehensive analytical testing including HPLC for purity, spectrophotometry for strength and shade, and checks for insolubles and heavy metals. A Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your application requirements.

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 product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellowish powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture (Karl Fischer)	≤ 5.0%
Water Solubility	Clear solution at 1%
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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