Light Stabilizers (HALS)
Light Stabilizer UV-791
Blend of UV-944 (50%) and UV-770 (50%) — thick-section grade
The 944/770 synergistic blend for thick-section TPO and styrenics — outstanding long-term thermal stability.
Product Description
UV-791 blends oligomeric UV-944 with monomeric UV-770 at a 1:1 ratio: UV-944 provides long-term permanence, extraction resistance and deep section protection, while UV-770 delivers fast initial radical scavenging — together covering the whole aging window from surface to core.
It is the classic choice for thick-walled PP/EPDM (TPO) parts such as automotive bumpers and dashboards and for garden furniture, with proven use in PP/HDPE tapes and in styrenics such as ABS and HIPS; typical loadings are 0.1–0.8%.
The oligomeric fraction contributes outstanding long-term thermal stability, controlling color shift and melt flow even in filled or impact-modified systems; for light-colored parts, combine with UV-326/UV-328. Aolong UV-791 is pre-blended and homogenized, with the blend ratio verified by HPLC in each batch COA.
Key Features
- Classic thick-section TPO solution — surface-to-core coverage
- Outstanding long-term thermal stability for filled/modified systems
- Also suited to styrenics (ABS/HIPS)
- Premixed and homogenized, HPLC-verified blend ratio
Applications
- Automotive bumpers and dashboards (PP/EPDM TPO)
- Thick-wall PP moldings and garden furniture
- PP/HDPE tapes and woven fabrics
- Styrenic resins such as ABS and HIPS
- PP/PE/EPDM blends
Specifications
| CAS No. | Blend of UV-944 / UV-770 (1 : 1) |
|---|---|
| Molecular Formula | Mixture |
| Molecular Weight | Mixture |
| Appearance | White to pale yellow granule |
| Blend Ratio (944 : 770) | 50 : 50 (± 3%) |
| Volatility | ≤ 1.0% |
| Ash Content | ≤ 0.1% |
Packaging & Storage
20 kg bag or 25 kg fiber drum with PE liner. Store cool, dry and protected from light; shelf life 24 months in original sealed packaging.
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