CAS:4404-43-7
Molecular Formula:C40H44N12O10S2
Molecular Weight:916.98
EINECS:224-548-7
Synonyms:CALCOFLUOR WHITE ST; CI 40622; Fluorescent Brightener28,Calcofluor White M2R, TinopalUNPA-GX; V56; Optiblanc NL; 2.5-Bis(5-tertbutyl-2-benzoxazlyl)phiophene; 5-triazin-2-yl]amino]–6-(phenylamino)-3; c.i.fluorescentbrighteningagent28; Fluorescentbrightener(OB); TINOPAL UNPA-GX; TINOPAL LPW
Fluorescent Brightener 28 CAS 4404-43-7 （CAS 4193-55-9）is a high-efficiency, bis-triazinylaminostilbene-based optical brightening agent (OBA). It 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. Fluorescent Brightener 28 is particularly valued in polymer and coating applications for its excellent thermal stability and compatibility.
FLUORE CENT BRIGTENER 28 light yellow powder, odorless, soluble in alkanes, fats, mineral oils, paraffin, and most organic solvents. The maximum absorption value of the spectrum is 375mm (in ethanol), and the maximum emission wavelength is 435nm (in ethanol).
| ITEM | Industrial Grade |
| Appearance | Yellow-greenish powder |
| Whiteness | Correspond to standard ±1.5 |
| E Value | 510-550 |
| Moisture Content | ≤5% |
(1) Plastics Industry: Fluorescent Brightener 28 CAS 4193-55-9 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: Fluorescent Brightener 28 CAS 4193-55-9 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: Fluorescent Brightener 28 CAS 4193-55-9 applied in high-quality paper coating and as an optical brightener in some industrial detergent formulations.
(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.
Usually packed in 25kg/drum,and also can be do customized package.
EN 
ZH 
DE 
ES 
KO 
PT 
FR 
TH 
AR 
IT 
VI 
NL 
RU 
