Description

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

Application

• Laundry Detergents & Fabric Softeners: As a key optical brightener to make white fabrics appear brighter and colored fabrics more vivid.
• Paper Manufacturing: For whitening high-quality writing, printing, and tissue papers to achieve a brilliant white finish.
• Textile & Fiber Treatment: Applied in the finishing process of cotton, nylon, and other fibers to enhance whiteness and brightness.
• Plastics & Synthetic Polymers: Incorporated into polymers like PVC, polyolefins, and coatings to correct yellowness and improve aesthetic appeal.
• Soaps & Personal Care Products: Used in certain formulations to impart a clean, bright white appearance to the final product.
• Advanced Material Coatings: For specialized applications requiring UV-to-visible light conversion and fluorescence.

Basic Information

Product Name	Disodium 4,4'-Bis[[6-Anilino-4-[(2-Hydroxypropyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate
CAS No.	32694-95-4
Molecular Formula	C40H38N12Na2O10S2
Molecular Weight	972.90 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal UNPA-GX; Stilbene-based Optical Brightener OB-1; Disodium 4,4'-bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonate (related compound); 2,2'-(1,2-Ethenediyl)bis[5-[[4-[(2-hydroxypropyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] disodium salt; FWA 71; Optical Brightening Agent 71; 4,4'-Bis[(4-anilino-6-(2-hydroxypropylamino)-s-triazin-2-yl)amino]-2,2'-stilbenedisulfonic acid disodium salt.
EINECS	251-171-5

Quality Control

Our production of Disodium 4,4'-Bis[[6-Anilino-4-[(2-Hydroxypropyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for strength, and checks for critical impurities. We provide full traceability and Certificates of Analysis (COA) are available upon request to ensure your quality and regulatory compliance needs are met.

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) and light-sensitive; prolonged exposure to moisture or direct light should be avoided to maintain stability and efficacy.

Specification

Item	Specification
Appearance	Yellowish to off-white powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Fluorescence Strength	98.0 - 102.0% (vs. Standard)
Water Content (KF)	≤ 5.0%
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm
Sulfated Ash	≤ 0.5%

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