The Smart Buyer’s Guide to HALS for PP, PE, and PVC: Why LS-944, LS-622, LS-770, and LS-119 Deliver More Than Just UV Protection
It Started With a Simple Inquiry
“Hello, this is Parachem in Korea. We are a trading company of flame retardants for the plastic and rubber industry. My customer wants to buy HALS for PP, PE, and PVC from us. So can you recommend some products? (Powder-type HALS for PP, PE, PVC)”
This message arrived in our inbox not long ago, and it’s a question we hear more often than you’d expect.
As a technical supplier, we know what lies behind this simple request: high-stakes decisions, customer satisfaction, and the pressure to deliver reliable, regulatory-compliant additives that actually perform in the field.
So here’s our deep dive answer—for Parachem and every other buyer looking for dependable HALS (Hindered Amine Light Stabilizers) for polypropylene (PP), polyethylene (PE), and polyvinyl chloride (PVC).
In this article, you’ll discover:
- What HALS do and why they matter
- How to match HALS with polymers
- What makes LS-944, LS-622, LS-770, and LS-119 our top recommendations
- How to use them
- Case studies and performance benchmarks
- FAQs for procurement and compliance teams
Let’s get into it.
Why HALS Are Essential in Plastics
Plastics are vulnerable. Under UV exposure, their molecular chains degrade. They lose mechanical strength, discolor, chalk, and crack. Without protection, the service life of outdoor plastics plummets.
HALS are the most effective stabilizers against UV damage. Unlike UV absorbers, HALS do not absorb UV radiation. Instead, they trap and neutralize the free radicals generated by UV light. Their regenerative mechanism allows continuous protection over long periods.
For plastics exposed to outdoor conditions—think greenhouse films, automotive bumpers, cables, roofing membranes—HALS are not optional. They’re insurance policies.
But not all HALS are the same. And some are better suited for certain polymers than others.
Choosing the Right HALS for PP, PE, and PVC
The request was clear: powder-type HALS suitable for PP, PE, and PVC.
After decades of formulation work and B2B collaboration, here’s what we recommend:
✅ LS-944 — The Heavyweight for Polyolefins
- Type: Polymeric HALS
- Appearance: White to pale yellow powder
- CAS Number: 70624-18-9
- Best for: PP, PE, TPO, TPU, outdoor plastics
LS-944 is a non-migratory, high-molecular-weight HALS that provides outstanding long-term protection. It’s especially effective in PP and PE where migration resistance and durability are critical.
- Excellent thermal stability
- Low volatility
- Works synergistically with antioxidants (AO-1010, AO-168)
- REACH registered, FDA compliant, RoHS compliant
Recommended dosage: 0.1–0.5%
✅ LS-622 — The PVC Specialist
- Type: Oligomeric HALS
- Appearance: Pale yellow powder
- CAS Number: 65447-77-0 / 70624-18-9 (mixture)
- Best for: Flexible and rigid PVC, as well as PE blends
LS-622 has a unique structure that resists extraction and blooming, making it ideal for flexible PVC applications. It also improves weathering performance in PE/PVC blends.
- Moderate molecular weight
- Low interaction with plasticizers
- Excellent extraction resistance
- Good cost-performance ratio
Recommended dosage: 0.2–0.5%
✅ LS-770 — The Classic All-Rounder
- Type: Monomeric HALS
- Appearance: White crystalline powder
- CAS Number: 52829-07-9
- Best for: General use in PP, PE, and PVC
LS-770 is a cost-effective HALS option known for its versatility. While not as durable as polymeric HALS, it provides solid UV protection in lower-demand applications.
- Easy to blend
- Effective in thin-walled parts
- Compatible with a wide range of polymers
Recommended dosage: 0.05–0.3%
✅ LS-119 — The High-Performance Hybrid
- Type: Polymeric HALS with high nitrogen content
- Appearance: Slightly yellow powder
- CAS Number: 106990-43-6
- Best for: High-performance PP and PE, films, fibers
LS-119 offers a balance between polymer compatibility and cost-efficiency. It performs particularly well in thin films and molded parts exposed to intense UV.
- Good pigment interaction
- Low migration
- High thermal resistance
Recommended dosage: 0.1–0.3%
Performance Snapshot
| HALS Type | Migration Resistance | Polymer Compatibility | Cost | Durability |
|---|---|---|---|---|
| LS-944 | Excellent | PP, PE, TPO | $$$ | ★★★★★ |
| LS-622 | Very Good | PVC, PE | $$ | ★★★★☆ |
| LS-770 | Moderate | PP, PE, PVC | $ | ★★★☆☆ |
| LS-119 | High | PP, PE, Films | $$ | ★★★★☆ |
How to Formulate with HALS
- LS-944 and LS-119 should be used where high UV resistance is needed—automotive, outdoor furniture, roofing sheets.
- LS-622 is the go-to choice for flexible PVC cables, banners, and coated fabrics.
- LS-770 can be considered for indoor or shaded applications where cost is a primary factor.
Always test compatibility with pigments, antioxidants, and other additives. Synergistic blends (e.g., HALS + AO) often give the best result.
Case Studies
🌞 Agricultural Films in Southeast Asia
A converter using PE greenhouse films switched from a monomeric HALS to LS-944. Product life doubled. Field complaints dropped by 70%.
🚗 Dashboard Panels in Europe
An OEM supplier reformulated their TPO parts with LS-119. Post-UV-exposure cracking dropped to near zero. Lab pass rates hit 96%.
📦 PVC Packaging in the Middle East
Flexible PVC bags with LS-622 resisted yellowing for 18 months under sun-simulation aging. Without LS-622, degradation started at 6 months.
FAQs from B2B Buyers
Q: Are these HALS available in powder form?
A: Yes. All recommended HALS—LS-944, LS-622, LS-770, LS-119—are offered in powder form.
Q: Can we get samples?
A: Absolutely. Free samples and technical data sheets can be arranged upon request.
Q: What about compliance?
A: All listed HALS comply with REACH and RoHS. LS-944 and LS-119 are also FDA 21 CFR approved. Full documentation is available.
Q: Do you provide formulation support?
A: Yes. Our technical team provides formulation guidance and test protocols for film, injection molding, extrusion, and more.
Your Next Step
HALS are more than stabilizers—they’re value multipliers. They help products survive outdoors, resist complaints, and keep your customers loyal.
If your clients in Korea need powder-type HALS for PP, PE, and PVC—give them something they’ll remember. Recommend LS-944, LS-622, LS-770, or LS-119.
We’ll help you choose, test, and succeed.
Let’s get started. Request a sample, schedule a call, or ask a technical question today.
