UV Absorber 328
CAS Number: 25973-55-1
UV Absorber 328 (2-(2-hydroxy-3,5-di-tert-amylphenyl)benzotriazole) is a benzotriazole UV stabilizer with excellent compatibility in a broad range of polymers and coatings. It efficiently absorbs UV radiation in the 300–380 nm range, protecting substrates from photodegradation, yellowing, and loss of mechanical properties. UV-328 is suitable for thin-film applications due to its good solubility in common plasticizers and solvents.
Technical Specifications
| appearance | Light yellow powder |
| purity (%) | ≥99.0 |
| ash content (%) | ≤0.1 |
| loss on drying (%) | ≤0.3 |
| melting point (°C) | 77–82 |
Applications
- PVC flexible film and packaging
- Polyurethane coatings and adhesives
- Polystyrene and ABS articles
- Polyolefin greenhouse film
- Rubber and elastomer weathering protection
Key Features
- Good solubility in plasticizers for easy incorporation
- Broad UV absorption in 300–380 nm range
- Excellent compatibility with PVC and polyurethane
- Effective protection against yellowing and embrittlement
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CAS Number
25973-55-1
Category
Plastic / Rubber AdditivesAvailability
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