Description

Disodium 4,4'-Bis[(4-Anilino-6-Methoxy-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate is a high-performance fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene class. It is valued for its exceptional ability to absorb UV light and re-emit it as a bright blue fluorescence, thereby compensating for yellowish tints and enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects in their products.

Application

• Textile Finishing: Primary use as an optical brightener for cotton, nylon, wool, and synthetic fibers to achieve high whiteness grades.
• Paper Manufacturing: Key additive in high-quality writing, printing, and tissue papers to improve brightness and opacity.
• Detergent & Laundry Care: Formulation component in laundry detergents, fabric softeners, and soaps to make white fabrics appear brighter and colors more vivid.
• Plastics & Polymers: Incorporated into polymers like PVC, polyolefins, and coatings to prevent yellowing and enhance visual appeal.
• Advanced Materials: Used in specialty applications such as security paper, banknotes, and photographic materials for its fluorescent properties.

Basic Information

Item	Details
Product Name	Disodium 4,4'-Bis[(4-Anilino-6-Methoxy-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate
CAS No.	3426-43-5
Molecular Formula	C40H30N12Na2O8S2
Molecular Weight	924.83 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal UNPA-GX; Blankophor BSU; Disodium 4,4'-bis[(4-anilino-6-methoxy-s-triazin-2-yl)amino]stilbene-2,2'-disulfonate; 4,4'-Bis[(4-anilino-6-methoxy-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; FWA 71; Optical Brightener OB-1 (specific grade); Stilbene triazine fluorescent whitening agent
EINECS	222-322-1

Quality Control

Our production of Disodium 4,4'-Bis[(4-Anilino-6-Methoxy-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management systems. Every batch undergoes comprehensive analytical testing to ensure consistent purity, fluorescence strength, and application performance. Certificates of Analysis (COA) detailing key parameters such as assay, hue, and solubility are provided to guarantee product integrity and traceability for our global B2B clients.

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 incompatible materials and sources of heat. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product stability.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Fluorescence Intensity	≥ 100% of standard
Moisture Content	≤ 5.0%
Ash Content (Sulfated)	≤ 0.5%
pH (1% Aqueous Solution)	7.0 - 9.0
Solubility in Water	Freely soluble

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