Tinuvin 328 CAS 25973-55-1
Product Name: Tinuvin 328
Chemical Name: 2-(2′-Hydroxy-3′,5′-dipentylphenyl)benzotriazole
Another Name: UV absorber Uv 328
CAS No.: 25973-55-1
Molecular Formula: C22H29N3O
MolecularWeight: 351.49
Appearance: Pale yellow crystalline powder
Assay: ≥99%
Tinuvin 328 (CAS 25973-55-1): Technical Guide for Polymer Light Stabilization
Table of Contents
1. Product Overview & Comparative Analysis
| Parameter | Tinuvin 328 | Conventional UV Absorbers |
|---|---|---|
| Chemical Class | Phenolic benzotriazole | Standard benzotriazole |
| Molecular Weight | 351.5 g/mol | 200-300 g/mol |
| UV Absorption Range | 300-400 nm (Peak: 306/347 nm) | 280-360 nm |
| Thermal Stability | Decomposition starts at 223°C | Typically <200°C |
| Vapor Pressure (20°C) | 4.7 × 10-6 Pa | 1 × 10-5-1 × 10-4 Pa |
2. Functional Applications
Core Function: Provides surface stabilization against UV-induced:
- Chain scission in polyolefins
- Yellowing in transparent polymers
- Loss of mechanical strength in engineering plastics
Material Compatibility:
| Polymer Type | Recommended Loading | Synergistic Additives |
|---|---|---|
| Polystyrene (PS) | 0.3-0.7% | Hindered amine light stabilizers |
| Polyvinyl Chloride (PVC) | 0.2-0.5% | Organotin stabilizers |
| Engineering Plastics | 0.4-1.0% | Phosphite antioxidants |
3. Implementation Protocols
Processing Guidelines:
- Melt Compounding: Compatible at temperatures up to 280°C
- Solution Blending: Dissolves in dichloromethane (56% solubility)
- Fiber Spinning: Maintain <1% moisture content
4. Industry Case Studies
Automotive Interior Components:
0.45% Tinuvin 328 in PP composites reduced UV-induced cracking by 72% after 2,000 hrs Xenon exposure (SAE J2527)
Outdoor Cable Jacketing:
0.3% loading in PE maintained 89% tensile strength retention after 5-year Florida exposure
5. Client Success Stories
Case 1: Advanced Materials Co., Ltd.
- Application: Transparent polycarbonate roofing sheets
- Result: Yellowness index ΔY<10 after 3 years outdoor exposure
Case 2: Polymer Solutions Provider
- Application: UV-stable PVC window profiles
- Result: Achieved EN 12608 weathering compliance
6. Technical Consultation
Our polymer stabilization experts provide:
- Material compatibility testing
- Accelerated weathering reports
- Regulatory compliance guidance
Contact our technical team:
Email: info@vivalr.com
Tel: (86) 15866781826
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