Description

Disodium 4,4'-Bis[(4-Amino-6-Anilino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate is a high-performance fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene 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 substrates. It is a critical raw material for manufacturers in the detergent, paper, textile, and plastics industries seeking to improve product aesthetics and market appeal.

Application

• Laundry Detergents & Fabric Softeners: Primary application as an optical brightener to make white fabrics appear brighter and colored fabrics more vivid.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-grade brightness in printing papers, tissues, and board.
• Textile & Fiber Treatment: Applied in finishing baths for cotton, nylon, and other fibers to compensate for yellowness and enhance whiteness.
• Plastics & Synthetic Polymers: Incorporated into polymers like PVC, polyethylene, and polypropylene to improve the brightness of molded articles and films.
• Soaps & Personal Care Products: Utilized in certain soap bars and cosmetic formulations where a whitening effect is desired.
• Advanced Coatings: Functions in specialty paints and coatings to provide a bright, clean visual finish.

Basic Information

Product Name	Disodium 4,4'-Bis[(4-Amino-6-Anilino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate
CAS No.	20579-01-5
Molecular Formula	C40H30N14Na2O6S2
Molecular Weight	924.91 g/mol
Synonyms	Fluorescent Brightener 71; FB 71; Tinopal UNPA-GX; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; Disodium 4,4'-bis[(4-anilino-6-morpholino-s-triazin-2-yl)amino]stilbene-2,2'-disulfonate; Stilbene triazine fluorescent whitening agent; Optical brightener VBL type; CI Fluorescent Brightener 71
EINECS	243-903-7

Quality Control

Every batch of our fluorescent whitening agent is produced under a strict quality management system. We perform comprehensive in-process and final release testing to ensure consistent performance, including HPLC assay for purity, spectrophotometric analysis for strength and hue, and tests for solubility and physical properties. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming compliance with agreed specifications.

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). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product efficacy.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Strength (Spectrophotometry)	100 ± 3% of standard
Moisture Content (Karl Fischer)	≤ 5.0%
Ash Content	≤ 0.5%
Solubility in Water	Clear, yellow-green solution
pH (1% Aqueous Solution)	7.0 - 9.0

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