Description

Diammonium 4,4'-Bis[(4-Amino-6-Anilino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate is a high-purity, fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene disulfonate chemical class. This compound is valued for its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the perceived 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 optical brightening effects. The product is supplied as a fine powder, optimized for consistent performance and ease of formulation.

Application

This advanced fluorescent whitening agent is engineered for high-performance applications where brilliant whiteness and light fastness are paramount.

• Textile Finishing: Primary application for whitening and brightening cotton, wool, nylon, and silk fibers during scouring, bleaching, or finishing processes.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high-grade brightness in fine papers, art papers, and board.
• Detergent & Laundry Care: A key ingredient in premium laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered fabrics.
• Plastics and Synthetic Fibers: Incorporated into polymers like polyamide (nylon), polyester, and PVC to correct yellowness and improve aesthetic appeal.
• Cosmetics and Personal Care: Used in formulations where a brightening or whitening optical effect is desired.
• Advanced Coatings and Paints: Employed in specialty coatings to enhance brightness and opacity.

Basic Information

Item	Details
Product Name	Diammonium 4,4'-Bis[(4-Amino-6-Anilino-1,3,5-Triazin-2-Yl)Amino]Stilbene-2,2'-Disulphonate
CAS No.	32866-17-4
Molecular Formula	C40H38N14O6S2 · 2NH3 (or C40H44N16O6S2)
Molecular Weight	917.06 g/mol (Free acid form: 843.00 g/mol)
Synonyms	Fluorescent Brightener 71; Tinopal 5BM; Blankophor BSU; FWA 71; 4,4'-Bis[(4-anilino-6-amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid diammonium salt; Diammonium 4,4'-bis[(4-anilino-6-amino-s-triazin-2-yl)amino]stilbene-2,2'-disulfonate; Optical Brightener OB-71
EINECS	Contact for details

Quality Control

Our production of Diammonium 4,4'-Bis[(4-Amino-6-Anilino-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 shade, and checks for solubility and residue on ignition. We provide full traceability and Certificates of Analysis (COA) are available for all shipments, ensuring the product meets the consistent performance standards required by our global industrial customers.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after use to prevent absorption of atmospheric moisture, which can affect performance and flow characteristics. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish-green fine powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	98 - 102% (vs. Standard)
Shade	Standard Blue-White
Moisture (KF)	≤ 5.0%
Solubility in Water	Clear, yellow-green solution
Residue on Ignition	≤ 0.5%

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