Fluorescent Brightener 28 CAS 4193-55-9

CAS: 4193-55-9

Molecular Weight: 843.0

EINECS: 200-312-9

Storage Period: Store in a cool, dry

Synonyms: Optical Brightener 28; Tinopal UNPA; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid disodium salt; FWA 28

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What is Fluorescent Brightener 28 CAS 4193-55-9?

Fluorescent Brightener 28 is a high-efficiency, bis-triazinylaminostilbene-based optical brightening agent (OBA). Optical brightener 28 absorbs ultraviolet light (300-400 nm) and re-emits it as intense blue-violet fluorescence (400-500 nm), effectively masking the inherent yellowness of substrates and producing a bright, visually white appearance. Optical Brightener 28 is particularly valued in polymer and coating applications for its excellent thermal stability and compatibility.

Specification

ITEM	Industrial Grade
Appearance	Yellow-greenish powder
Whiteness	Correspond to standard ±1.5
E Value	510-550
Moisture Content	≤5%

Application

(1) Plastics Industry:
Fluorescent brightener 28 widely used as a whitening agent for thermoplastics such as PVC, PP, PE, ABS, PS, and engineering plastics to enhance brightness and whiteness.
(2) Coatings & Paints:
An effective brightener for architectural paints, industrial coatings, automotive finishes, and UV-curable systems.
(3) Synthetic Fibers:
Optical brightener 28 used in the spin finishing or mass pigmentation of polyester, nylon, and acetate fibers to achieve brilliant whiteness.
(4) Inks & Masterbatches:
Key additive in specialty printing inks and white masterbatches for consistent whitening performance.
(5) Paper & Detergents:
Applied in high-quality paper coating and as an optical brightener in some industrial detergent formulations.

Features

(1) High Whitening Efficiency: Provides intense blue-white fluorescence with low addition levels (typically 0.01%-0.1%).
(2) Excellent Thermal Stability: Withstands typical polymer processing temperatures up to 250-300°C without significant degradation.
(3) Good Light Fastness: Offers reasonable resistance to fading under long-term UV exposure.
(4) Broad Polymer Compatibility: Compatible with a wide range of polymer matrices and resin systems.
(5) Easy to Disperse: Can be readily incorporated into polymers via melt compounding or into liquid systems via high-speed dispersion.