Tiangang® BW-10LD (HS-622)
Hindered amine light stabilizer (hals) · BW-10LD
highly effective radical scavenger belonging to the Hindered Amine Light Stabilizers (HALS) family of stabilizers. It is a polymeric HALS with low melting range, which is very suitable for use in polypropylene
In one sentence: A polymeric high-molecular-weight hindered amine light stabiliser with good extraction and migration resistance, for long-term outdoor and thick-walled articles.
- 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)
- Packaging: 25 kg per drum (source: packaging note on this page)
What it is
Tiangang® BW-10LD (HS-622) 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: chemical name Butanedioic acid, dimethylester, polymer with 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol; CAS 65447-77-0.
Technical data
| Chemical name | Butanedioic acid, dimethylester, polymer with 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol |
| CAS number | 65447-77-0 |
| Structure |  |
| Description | Tiangang® BW-10LD (622) is a highly effective radical scavenger belonging to the Hindered Amine Light Stabilizers (HALS) family of stabilizers. It is a polymeric HALS with low melting range, which is very suitable for use in polypropylene, polyethylene, polyurethane, metaformaldehyde, polyamine and polyester. Tiangang® BW-10LD typically demonstrates reduced interaction with co-additives such as pigments or other stabilizers and is a stabilizer for systems containing high loadings of carbon black. |
| Tiangang® BW-10LD (622) | Appearance | Bulk density, kg/m3 | Molecular weight | Specific gravity, g/ml@ 35oC | Melting range, oC | Flash point, oC |
| Off-white solid | 570 | >2500 | 1.22 | 55~70 | >250 |
| Tiangang® BW-10LD (622) | Temperature | 250oC | 300oC | 325oC |
| Weight loss | <1.0% | <3.1% | <8.4% |
| Tiangang® BW-10LD (622) | Water | Acetone | Methyl alcohol | Xylene | Ethyl acetate | Hexane | Toluene | Methylene chloride |
| 0.01 | 2 | 0.1 | 8 | 5 | 0.01 | 18 | >67 |
| Tiangang® BW-10LD (622) | 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. |
| 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 BW-10LD: molecular weight and volatility, basicity, and compatibility with the other components in the system. The 622-series high-MW polymeric HALS: extraction and migration resistant for long-service and thick parts; slower onset, so a little 770 is often added for the early stage.
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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