UV-326 is a benzotriazole-type ultraviolet absorber with broad UV absorption (range: 300–400 nm), excellent chemical resistance, and wide compatibility with polymer systems.
It is especially suited for polyolefins, PVC, and styrenic resins, and performs well in pigmented and clear formulations. Thanks to its thermal stability and lightfastness, UV-326 is used in both indoor and outdoor plastic and coating applications.
| Property | Typical Value |
|---|---|
| Chemical Name | 2-(2H-Benzotriazol-2-yl)-4-(tert-butyl)-6-(sec-butyl)phenol |
| CAS No. | 3896-11-5 |
| Appearance | Light yellow powder or granules |
| Melting Point | 135 – 141 °C |
| UV Absorption Range | 300 – 400 nm |
| Thermal Stability | Good |
| Recommended Dosage | 0.1 – 0.5 phr |
| Challenge | UV-326 Solution |
|---|---|
| UV-induced yellowing and chalking | Effective absorption blocks harmful light |
| Degradation during film extrusion | Thermal stable during polymer processing |
| Additive migration issues | Low volatility minimizes bleed-out |
| Need for clear and tinted applications | Works well in transparent and colored systems |
| Budget limitations in formulation | High cost-performance ratio for general use |
Q1: What makes UV-326 different from UV-329 or UV-328?
UV-326 is more cost-efficient and better suited for polyolefins and PVC, while UV-329/328 target optical-grade or high-end engineering plastics.
Q2: Can UV-326 be used with HALS or antioxidants?
Yes. It shows strong synergy when used with HALS like Tinuvin 770 or antioxidants like AO-1010.
Q3: Is UV-326 suitable for high-temperature processing?
It has moderate heat stability. For very high temps (e.g., >280 °C), consider UV-234 or UV-329.
Q4: Is UV-326 recommended for clear packaging?
Yes, it works well in clear systems due to its low color impact and strong lightfastness.
Q5: What is the storage condition?
Keep in sealed original packaging, in a dry, ventilated, cool area. Avoid direct sunlight and humidity.
