UV Absorbers
UV Absorber UV-531
2-Hydroxy-4-n-octyloxybenzophenone
The cost-effective benzophenone with broad polymer compatibility from PE to PVC.
Product Description
UV-531 (also known as BP-12 or octabenzone) is the most widely used benzophenone UV absorber. Its octyloxy chain provides excellent compatibility across an unusually broad polymer spectrum — polyethylene, polypropylene, PVC, polystyrene, ABS and polyester — at highly economical cost per kilogram of protection.
In agricultural films, shrink wrap and outdoor furniture, UV-531 prevents UV-induced embrittlement and discoloration. It is frequently combined with HALS in films: the benzophenone absorbs UV radiation while the HALS interrupts the degradation chain reactions.
Typical loadings are 0.1–0.5 wt% in polyolefins and up to 1.0 wt% in PVC. Aolong UV-531 is crystallized to ≥99.0% assay with consistent melting range for predictable masterbatch let-down.
Key Features
- Broadest polymer compatibility among UV absorbers
- Economical protection for volume applications
- Good synergy with HALS in films and moldings
- Proven performance in PVC and polyolefins for decades
Applications
- PE and PP films, shrink and stretch wrap
- PVC profiles, films and tarpaulins
- Polystyrene and ABS moldings
- Outdoor furniture and crates
- Polyester fiber and films
Specifications
| CAS No. | 1843-05-6 |
|---|---|
| Molecular Formula | C21H26O3 |
| Molecular Weight | 326.43 |
| Appearance | Pale yellow crystalline powder |
| Assay (HPLC) | ≥ 99.0% |
| Melting Point | 47 – 50 °C |
| Loss on Drying | ≤ 0.5% |
Packaging & Storage
25 kg fiber drum with PE liner or 25 kg carton. Store cool, dry and protected from light; shelf life 24 months in original sealed packaging.
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