UV-329 is a high-performance benzotriazole-type UV absorber designed to protect transparent and semi-transparent polymers from UV degradation. It efficiently absorbs UV light in the 300–400 nm range and offers excellent thermal stability and lightfastness, making it especially suitable for polymers used outdoors or under intense UV exposure.
Compared to other UV absorbers, UV-329 is known for its low color contribution, high migration resistance, and broad polymer compatibility.
| Property | Typical Value |
|---|---|
| Chemical Name | 2-(2H-Benzotriazol-2-yl)-4,6-di-tert-butylphenol |
| CAS No. | 3147-75-9 |
| Appearance | Light yellow crystalline powder |
| Melting Point | 156 – 160 °C |
| UV Absorption Range | 300 – 400 nm |
| Volatility | Very low |
| Light Stability | Excellent |
| Recommended Dosage | 0.1 – 0.5 phr |
| Problem | UV-329 Solution |
|---|---|
| Yellowing or haze in clear polymers | Strong UV absorption without affecting color |
| Material degradation in UV exposure | Preserves surface quality and strength |
| Additive migration or blooming | High resistance to volatilization and bleed |
| Optical distortion from additives | UV-329 offers minimal refractive interference |
| Need for low dosage & high effect | Effective even at low loading levels |
Q1: Can UV-329 be used in transparent PC or PET?
Yes, UV-329 is optimized for transparent polymers and maintains optical clarity.
Q2: What stabilizers can be combined with UV-329?
It can be paired with HALS (e.g., Tinuvin 770) and antioxidants (e.g., AO-1076) for comprehensive protection.
Q3: Does UV-329 affect color or tint in plastics?
No, it has a very low intrinsic color and is suitable for light-colored or clear formulations.
Q4: What’s the typical shelf life?
UV-329 remains stable for at least 24 months if stored in sealed containers under dry conditions.
Q5: Is UV-329 suitable for food-contact materials?
Please refer to local regulations (e.g., FDA or EU) for specific application limits.
