Specification
Ultraviolet absorber UV-329 (also known as light stabilizer 329, trade names Tinuvin 329, Cyasorb 5411) is a highly efficient benzotriazole class ultraviolet absorber. It effectively protects polymer materials from photodegradation by converting harmful ultraviolet energy into harmless heat energy for release, thereby significantly extending the service life of products.
With its excellent ultraviolet absorption capacity, low volatility, and good compatibility, this product is particularly suitable for transparent products and engineering plastic systems processed at high temperatures.
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Molecular Formula: C20H25N3O |
Molecular Weight: 323.43 |
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CAS No: 3147-75-9 |
Appearance: Light Yellow powder |
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Assay:99% |
Melting point(℃): 79.00-87.00℃ |
Features
This product UV 329 has good light transmittance in visible light range, so it is widely used in various optical materials and can be added to the polymer materials contacting with food.
Applications
UV 329 is widely used in polymers and other organic substances, including polycarbonate, rigid PVC, flexible pvc.
Due to its excellent ultraviolet absorption performance and good processing stability, UV-329 is widely used in various polymer material systems.
1. Plastics Industry (Primary Application)
Suitable for a wide range of engineering plastics and commodity plastics, especially recommended for:
| Resin Type | Applicability Description | Recommended Addition Level |
|---|---|---|
| Polycarbonate (PC) | Specially recommended, prevents yellowing and loss of mechanical properties | 0.1-0.5% |
| Polyester (PET, PBT) | Specially recommended, suitable for fibers and films | 0.1-0.5% |
| Polyvinyl Chloride (PVC) | Outdoor applications for rigid and plasticized PVC | 0.25-1.0% |
| ABS | Improves outdoor aging resistance | 0.25-0.75% |
| Polystyrene (PS, HIPS) | Improves weatherability | 0.1-0.5% |
| Polymethyl Methacrylate (PMMA) | Maintains transparency and weatherability, used for optical devices | 0.1-1.0% |
| Polyamide (PA) | Light stabilization for nylon materials | 0.1-0.5% |
| Polyurethane (PU) | UV protection for elastomers and coatings | 0.2-0.8% |
| Epoxy Resin | Yellowing protection for electronic encapsulation materials | 0.5-1.0% |
| Polyolefins (PP, PE) | Outdoor applications for commodity plastics | 0.1-0.5% |
2. Coatings Industry
Suitable for high-performance coating systems:
| Coating Type | Application Description | Recommended Addition Level (based on solids content) |
|---|---|---|
| Automotive Paints | Prevents coating fading and chalking | 0.5-2.0% |
| Architectural Coatings | Improves weatherability of exterior wall coatings | 0.5-2.0% |
| Powder Coatings | Resists high-temperature baking, protects the coating | 1.0-2.0% |
| Coil Coatings | Improves outdoor weatherability | 1.0-3.0% |
3. Fibers and Films
Due to low volatility and good compatibility, particularly suitable for:
Polyester Fibers: Mass coloration and outdoor textiles, recommended dosage: 0.2-0.5%
Agricultural Films: Extends service life, recommended dosage: 0.1-0.3%
Packaging Films: UV protection for transparent products, recommended dosage: 0.1-0.3%
Optical Films: Light stabilization for LCD, OLED display materials
4. Other Applications
Resin lenses and optical devices
Automotive interior and exterior parts
Electronic and electrical enclosures
Building materials (pipes, sheets, profiles)
Rubber products (seals, tires)
Adhesives and sealants
Package & Storage
25kg/ fiber drums. It can be packed in other forms according to user's requirements.
Shelf life: not more than 24 months in the room temperature.
Synergistic Effects
Synergistic Effects
In outdoor applications, UV-329 is typically used in combination with the following additives to achieve optimal light stabilization:
| Combination Type | Recommended Formulation | Explanation of Synergistic Effect |
|---|---|---|
| Hindered Amine Light Stabilizer (HALS) | UV-329 + HALS-944 / HALS-770 | UV-329 absorbs UV light, while HALS captures free radicals, significantly improving weatherability |
| Phenolic Antioxidant | UV-329 + Antioxidant 1010 | Prevents dual aging from thermo-oxidation and photo-oxidation |
| Phosphite Antioxidant | UV-329 + Antioxidant 168 | Improves processing stability, providing synergistic protection |
| Compound System | UV-329 + Antioxidant 1010 + Antioxidant 168 + HALS | Comprehensive thermo-oxidative and photo-oxidative stabilization system |
Regulatory Compliance
UV-329 is non-toxic, non-flammable, non-explosive, non-corrosive, and has good storage stability. This product complies with the following regulatory requirements:
FDA (USA): 21 CFR Certification
EU 10/2011 (EU): Food Contact Materials Standard
Comparison between UV-329 and UV-234
| Characteristic | UV-329 | UV-234 |
|---|---|---|
| CAS No. | 3147-75-9 | 70321-86-7 |
| Molecular Weight | 323.44 | 447.6 |
| Melting Point | 103-105°C | 137-143°C |
| TGA 5% Weight Loss Temperature | ~220°C | 330°C |
| Applicable Resins | PC, ABS, PMMA, PET, PVC, PS | High-temperature engineering plastics (PC, PET, PA, PPS) |
| Recommended Applications | Conventional processing temperature plastics, transparent products | Ultra-high temperature processing engineering plastics, extreme weather resistance requirements |
| Effect on Color | Extremely low, suitable for highly transparent products | Extremely low, suitable for highly transparent products |
*Note: UV-234 offers superior thermal stability and is suitable for applications requiring higher processing temperatures or greater weather resistance; UV-329 offers better cost-effectiveness and is suitable for conventional applications.
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