Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Rianox RIANOX UV-328 Benzotriazole UV Absorber

Rianox RIANOX UV-328 is a high-performance benzotriazole-type UV absorber from Rianox’s specialty additives portfolio, offering exceptional photostability and thermal resistance for polymers, coatings, and adhesives. It effectively absorbs UV radiation (290–400 nm), preventing yellowing and degradation while maintaining clarity and mechanical integrity in demanding outdoor applications.
  • rianox rianox uv 328 benzotriazole uv absorber_5ab05813
  • rianox rianox uv 328 benzotriazole uv absorber_5ab05813

Features Of Rianox RIANOX UV-328 Benzotriazole UV Absorber

  1. Highly effective broad-spectrum UV absorption in the 270–380 nm range

  2. Excellent compatibility with common polymers including polyolefins, ABS, and polycarbonate

  3. Good thermal stability up to 250 °C during processing

  4. Low volatility and minimal migration in end-use applications

  5. Non-discoloring performance with long-term lightfastness retention

Typical Applications Of Rianox RIANOX UV-328 Benzotriazole UV Absorber

  1. Automotive interior plastics (dashboards, trim components)

  2. Outdoor construction materials (PVC profiles, polymer-modified bitumen)

  3. Packaging films for UV-sensitive contents (pharmaceuticals, agrochemicals)

  4. Coatings and inks requiring durable UV protection

  5. Engineering thermoplastics used in consumer electronics housings

Specifications Of Rianox RIANOX UV-328 Benzotriazole UV Absorber

Chemical TypeBenzotriazole-based UV absorber
Product FormOff-white to light yellow crystalline powder
AppearanceFree-flowing crystalline solid
Molecular FormulaC20H12N4O
Molecular Weight332.34 g/mol
Melting Point129–132 °C
SolubilitySoluble in chlorinated hydrocarbons, aromatic solvents; low solubility in aliphatic hydrocarbons and water
Primary ApplicationsUV stabilization of plastics, coatings, and adhesives


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