Description

Disodium 4,4'-Bis[(4,6-Diamino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate is a high-purity, synthetic organic compound belonging to the class of fluorescent whitening agents (FWAs) or optical brighteners. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the perceived whiteness and brightness of materials. This product is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to improve the aesthetic appeal of their finished goods. Consistent quality and reliable supply are critical for maintaining uniform product coloration and performance in demanding industrial processes.

Application

This fluorescent whitening agent is engineered for superior performance across multiple high-volume industrial sectors. Its primary and related applications include:

• Textile Finishing: As a critical additive in laundry detergents and fabric softeners to impart a "whiter-than-white" appearance to cotton, polyester, and polyamide fibers.
• Paper Manufacturing: Used in coating formulations and pulp to enhance the brightness and opacity of high-quality writing, printing, and packaging papers.
• Plastics and Polymers: Incorporated into synthetic fibers (like polyester and nylon) during polymerization or as a masterbatch to correct yellowness and improve visual appeal.
• Detergent & Soap Industry: A key component in premium powder and liquid laundry detergents to compensate for fabric yellowing and maintain brightness over repeated washes.
• Cosmetics and Personal Care: Employed in certain formulations, such as shampoos and soaps, to enhance the visual perception of purity and cleanliness.
• Coatings and Paints: Used in specific clear coatings and varnishes to achieve optical brightening effects on substrates.

Basic Information

Product Name	Disodium 4,4'-Bis[(4,6-Diamino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate
CAS No.	26858-65-1
Molecular Formula	C22H20N12Na2O6S2
Molecular Weight	690.63 g/mol
Synonyms	Fluorescent Brightener 71; FWA 71; Tinopal CBS-X; 4,4'-Bis[(4,6-diamino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Disodium 4,4'-bis(2,4-diamino-1,3,5-triazin-6-ylamino)stilbene-2,2'-disulfonate; Optical Brightener CBS-X; 2,2'-(1,2-Ethenediyl)bis[5-[(4,6-diamino-1,3,5-triazin-2-yl)amino]benzenesulfonic acid] disodium salt
EINECS	Contact for details

Quality Control

Our production of Disodium 4,4'-Bis[(4,6-Diamino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. The product is manufactured and tested in facilities that comply with ISO 9001 quality standards. Every lot undergoes comprehensive analysis, including assay (HPLC), identification (IR/UV), and tests for key impurities and moisture content. A detailed Certificate of Analysis (COA) documenting purity, physical properties, and performance characteristics is provided with each shipment and is available upon request.

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) and light-sensitive; therefore, containers must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture and degradation. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Identification (UV)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture (KF)	≤ 5.0%
Ash Content	≤ 0.5%
Fluorescence Intensity	≥ 95% of reference standard
Solubility (in water)	Clear, yellow solution

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