Tiangang® HS-625
Hindered amine light stabilizer (hals) · HS-625
highly effective oligomeric methylated hindered amine light stabilizer (Me-HALS), featuring high molecular weight, and lower interactions with acidic substances. It is particularly suitable for use in thin polyolefin applications. It also serves as long-term heat stabilizer
In one sentence: A low-basicity polymeric hindered amine light stabiliser for systems where sulfur, chlorine or acidic fillers would otherwise deactivate conventional HALS.
- Film, flat yarn, nonwoven dosage: 0.1 – 0.5% (source: recommended dosing table on this page)
- Injection mouldings, medium/thick-wall dosage: 0.3 – 1.0% (source: recommended dosing table on this page)
- Fibre and monofilament dosage: 0.3 – 0.8% (source: recommended dosing table on this page)
What it is
Tiangang® HS-625 is a hindered amine light stabilizer (HALS). HALS trap the radicals formed when a polymer photo-oxidises and regenerate in the process, so the protection window is longer than that of a UV absorber, which is consumed as it works. Product identifiers:
Technical data
| Chemical Name | Hindered amine derivative |
| Description | Tiangang® HS-625 is a novel patented oligomeric methylated hindered amine light stabilizer (Me-HALS), featuring high molecular weight, and lower interactions with acidic substances. It is particularly suitable for use in thin polyolefin applications. It also serves as long-term heat stabilizer. Its higher molecular weight and higher effective nitrogen content than conventional methylated HALS translate into better retention in thin applications such as film and fibre. It also offers much better protection in terms of long-term heat stability. This product is fully cleared for REACH and TSCA. FDA is being registered. It offers particularly good performances when used in combination with benzotriazole and triazine types of UV absorbers. |
| Appearance | Molecular weight | Softening range oC | Weight Loss - 10%, oC | |
| Tiangang® HS-625 | Pale yellow powder | > 2000 | 100 ~ 135 | > 350 |
| Tiangang® HS-625 | The use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling. Store the product in a cool, dry, well-ventilated area away from incompatible materials. |
| Light Stabilizer Disclaimer | The information supplied is presented in good faith and has been derived from sources believed to be reliable. Since conditions of use are beyond our control, all risks are assumed by the user. No representation is expressed or implied, and nothing herein shall be construed as permission or recommendation to practice a patented invention without license. |
Where it is used, and at what loading
Suitable for polyolefins (PP, PE), polyurethane, polyamide, polyacetal and polyester. Thin and thick parts call for different grades: thin sections suffer from volatilisation and migration, thick sections from surface bloom.
| Film, tape, nonwoven | 0.1 – 0.5% |
|---|---|
| Injection moulded and thick-wall parts | 0.3 – 1.0% |
| Fibre and monofilament | 0.3 – 0.8% |
Figures above are typical industry ranges, not guaranteed values. The actual loading depends on wall thickness, design life and the other additives in the system, and should be established by a loading ladder on the real formulation.
Choosing between similar grades
Three things decide the choice for HS-625: molecular weight and volatility, basicity, and compatibility with the other components in the system. Grade 625 is a low-basicity polymeric HALS aimed squarely at deactivation in acidic systems. The trade-off is slightly lower radical-scavenging efficiency, so formulations usually keep a margin.
Frequently asked questions
Is this grade meant for thin or thick parts?
It depends on molecular weight and migration tendency. Low-MW grades diffuse quickly and act early but volatilise and migrate over time; high-MW grades (HS-950, HS-362, BW-10LD) suit long-service outdoor parts. Tiangang offers both, so the choice follows wall thickness and design life.
Is it worth combining with a UV absorber?
Yes, they cover different stages. The UV absorber shields incoming UV energy; the HALS scavenges radicals that have already formed. Agricultural film, automotive exterior and PV backsheet usually need both to reach their design life.
What happens if the loading is too high?
Beyond the compatibility limit the additive blooms to the surface, which wastes material and harms appearance and print adhesion. Protection also stops scaling linearly. Our practice is a loading ladder on the actual system, then fix the cost-performance knee.
The figures and guidance above follow Tiangang's published technical material and common industry practice. For a specific formulation, refer to the batch COA and the technical agreement between the parties.
Certifications
- National High-Tech Enterprise
- Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
- Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
- Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
- Member, Society of the Plastics Industry (SPI), USA
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