Sinosorb® UV-328 / Tinuvin 328 / Eversorb 74 CAS 25973-55-1

Product name: UV Absorber UV-328

Chemical Name:2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol

Synonym:Eversorb 74;GSTAB 328;Tinuvin 328

Cas No.: 25973-55-1

MF: C22H29N3O

Purity: ≥99%(HPLC)


UV-328 / Tinuvin 328 / Eversorb 74 CAS 25973-55-1

Appearance Light yellow crystalline powder
Content ≥99%(HPLC)
Melting point 79-87℃
Ash ≤0.1%
Volatile ≤0.5%
Transmittance 460nm≥96%,500nm≥97%



1. This product is a high-efficiency ultraviolet absorber, which can effectively absorb ultraviolet light with a wavelength of 270-340 nanometers.
2. The light stabilization performance is similar to UV-326 and UV-327, but this product has good compatibility with resin, low thermal volatilization, and high washing resistance.
3. Mainly used for polyolefin (especially polyethylene), polyester, styrenic polymer, polyamide, polymethyl methacrylate, polycarbonate, elastomer and other polymers.

Suggested addition:

Polystyrene Polyethylene Polyester Polycarbonate Polyvinyl chloride
0.2-0.5% 0.2-0.4% 0.3-0.5% 0.15-0.3% 0.2-0.5%




Being kept in dry, clean warehouse with well ventilation.
Avoid exposing to light and heating for prevention of oxidation.
Protecting the product from leakage, rain and insolation during transportation.


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