Description

Fluorescent Brightener 181 is a high-performance stilbene-based optical brightening agent (OBA) designed to enhance the whiteness and brightness of synthetic materials. This compound is critical for manufacturers seeking to achieve superior visual appeal and perceived quality in their finished products under UV or daylight illumination. It is an essential additive for industries where brilliant whiteness and color correction are key competitive factors, particularly in polymer and fiber production.

Application

• Primary brightener for polyamide (nylon) fibers and textiles, including carpets, apparel, and technical fabrics.
• Effective whitening agent for polyester fibers, filaments, and yarns to counteract yellowing.
• Used in the production of engineering plastics and masterbatches to improve aesthetic quality.
• Application in synthetic leather and polymer coatings to achieve a bright, clean appearance.
• Formulation additive for detergents and laundry care products to impart a whitening effect on fabrics.
• Potential use in specialty paper coatings and high-value polymer films.

Basic Information

Product Name	Fluorescent Brightener 181
CAS No.	12224-37-2
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	FB 181; Fluorescent Brightener OB-1; 2,2'-(1,2-Ethenediyl)bis[5-[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid; Tinopal UNPA; Blankophor BSU; 4,4'-Bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; Optical Brightener 181
EINECS	Contact for details

Quality Control

Every batch of Fluorescent Brightener 181 is manufactured under a strict quality management system. We ensure consistent high purity and performance through advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and strength is provided with each shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat sources and incompatible materials. The product is light-sensitive and should be handled accordingly to maintain stability.

Specification

Item	Specification
Appearance	Yellowish powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Ash Content	≤ 0.5%
Absorbance (in solution)	Conforms to standard
Whiteness Degree (on substrate)	Standard sample match

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