Description

Fluorescent Brightener 191 is a high-performance stilbene-based optical brightening agent (OBA) designed to enhance the whiteness and brightness of synthetic materials. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and creating a brilliant, clean visual appearance. This product is essential for manufacturers in the textile, plastics, and detergent industries seeking to improve the aesthetic quality and market appeal of their finished products.

Application

• Primary whitening agent for synthetic fibers, including polyester, nylon, and acetate.
• Brightening component in laundry detergents and fabric softeners for enhanced wash performance.
• Additive in plastics and polymer resins to improve the whiteness of molded articles and films.
• Used in paper coating formulations to achieve high-brightness, premium-grade paper products.
• Application in the production of whitened adhesives and coatings.
• Potential use in specialty paints and inks where optical brightening is required.

Basic Information

Product Name	Fluorescent Brightener 191
CAS No.	12270-53-0
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	2,2'-(1,2-Ethenediyl)bis[5-[4-(4-morpholinyl)-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid; Fluorescent Brightener ER; Tinopal ER; Blankophor ER; Hakkol ER; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; CBS 191; FBA 191
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 191 is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for strength, and physical property checks, to ensure it meets precise industry specifications and delivers consistent performance. A Certificate of Analysis (COA) documenting all test results is provided with every shipment to guarantee traceability and compliance.

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. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture Content	≤ 2.0%
Ash Content	≤ 0.5%
Absorbance (in solution)	Conforms to standard range
Solubility	Soluble in common organic solvents

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