UV Absorber 327
CAS Number: 3864-99-1
UV Absorber 327 (2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole) is a high-performance benzotriazole UV absorber providing excellent protection for polyolefins, PVC, and engineering plastics against UV-induced degradation. Its high absorption in the 300–385 nm range and excellent thermal stability make it suitable for high-temperature processing. UV-327 is widely used in combination with HALS for comprehensive weathering protection.
Technical Specifications
| appearance | Light yellow to yellow powder |
| purity (%) | ≥99.0 |
| ash content (%) | ≤0.1 |
| loss on drying (%) | ≤0.3 |
| melting point (°C) | 154–158 |
Applications
- Polyolefin outdoor articles and films
- PVC window profiles and siding
- Engineering plastic automotive parts
- Adhesives and sealants
- Coatings and varnishes
Key Features
- High UV absorption efficiency in 300–385 nm range
- Excellent thermal stability for high-temp processing
- Low volatility and high permanence
- Synergistic with HALS light stabilizers
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CAS Number
3864-99-1
Category
Plastic / Rubber AdditivesAvailability
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