UV-327 is a benzotriazole-type ultraviolet absorber, designed to provide excellent protection against UV-induced degradation. It absorbs UV radiation in the 290–400 nm range and is especially useful in applications where lightfastness, gloss retention, and surface protection are critical.
Unlike benzophenone-type absorbers, UV-327 offers superior thermal stability, making it ideal for materials processed at high temperatures or exposed to long-term outdoor environments.
| Property | Typical Value |
|---|---|
| Chemical Name | 2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol |
| CAS No. | 3864-99-1 |
| Appearance | Light yellow powder or granule |
| UV Absorption Range | 290 – 400 nm |
| Melting Point | 137 – 141 °C |
| Volatility | Very low |
| Light Fastness | Excellent (Grade 7–8) |
| Recommended Dosage | 0.1 – 0.5 phr |
| Problem | How UV-327 Helps |
|---|---|
| Yellowing or fading in sun | Strong UVA protection ensures lasting color |
| Surface chalking or embrittlement | Maintains polymer integrity |
| Poor weathering in outdoor applications | Long-term resistance to sunlight and oxygen |
| Additive loss during processing | Low volatility keeps UV-327 in the material |
| Transparency issues | Minimal interference with optical clarity |
Q1: What polymers is UV-327 compatible with?
It works well in PE, PP, ABS, TPU, PU, PVC, PC, and more. Also suitable for solvent-based coatings and adhesives.
Q2: Can UV-327 be used with HALS or antioxidants?
Yes. It is often used with HALS like Tinuvin 770 and antioxidants (e.g. AO-1010) to form a full weathering protection system.
Q3: Is UV-327 heat stable during processing?
Yes. It remains stable in high-temperature applications such as extrusion or injection molding.
Q4: Can it be used in food-contact applications?
Please check local regulations (e.g., FDA, EU 10/2011). Some grades may not be food-safe.
Q5: How long does it protect the product?
UV-327 is designed for long-term outdoor exposure, typically lasting years depending on dosage and environment.
