UV 328, Tinuvin 328, CAS 25973-55-1

Chemical Name:

2-(2′-Hydroxy-3′, 5′-di-tert-amylphenyl) benzotriazole

Formula C22H29N3O  
Molecular Weight 351.5
CAS#  25973-55-1


uv absorber 328, tinuvin 328,

Physical Properties:

Appearance Yellowish powder or granule
Melting Point 79-87℃
Ash ≤0.1%
Loss On Drying ≤0.5%
Purity ≥99%(HPLC)
Transmittance 460nm≥96%

500 nm≥97%


UV 328 is a high-performance UV absorber that can effectively absorb 270-340 nm UV light. Its performance is similar to that of UV-326 and UV-327 while better compatibility with the resin, low thermal evaporation and high washing resistance. Tinuvin 328 is suitable for polyolefin (especially polyethylene), polyester, styrene polymer, polyamide, polymethyl methacrylate, polycarbonate, elastomer and other polymers.

Recommended dosage: PS 0.2-0.5%, PE 0.2-0.4%, PC 0.15-0.3%, PVC 0.2-0.5%, Polyester 0.3-0.5%.

Handing and safety:

>For additional handing and toxicological information, please consult us for Maternal Safety Date Sheet.


20/25KG cartons or drums.


UV Tinuvin 328 msds baoxu chemical