Tiangang® HS-450

Hindered amine light stabilizer (hals) · HS-450

very effective radical scavenger that protects organic polymers against degradation caused by exposure to ultraviolet radiation. It is effective in a range of polymers, such as PP, PE, ABS, and Nylon

In one sentence: A monomeric hindered amine light stabiliser with high melting point and decomposition temperature, for polyolefins and engineering plastics.

  • Molecular weight: 450 g/mol (source: spec table on this page)
  • Specific gravity (20 °C): 1.08 g/cm³ (source: spec table on this page)
  • Melting point: 155 ~ 158 °C (source: spec table on this page)
  • Decomposition temperature: >300 °C (source: spec table on this page)

What it is

Tiangang® HS-450 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: molecular weight 450; melting point 155 ~ 158.

Technical data

Chemical name
CAS number124172-53-8
StructureTechnical data
DescriptionTiangang® HS-450 is a very effective radical scavenger that protects organic polymers against degradation caused by exposure to ultraviolet radiation. It is effective in a range of polymers, such as PP, PE, ABS, and Nylon. Further that, Tiangang® HS-450 shows low water-carrying effect when used in applications like PP tapes, films and etc.
AppearanceMolecular weightSpecific gravity, g/cm3@ 20oCMelting range
oC		Decomposition Temp, oC
Tiangang® HS-450White crystalline powder4501.08155 ~ 158> 300
Tiangang® HS-450AcetoneChloroformMethanolEthyl acetaten-HexaneTolueneWater
0.36.011.00.3< 0.01250.5
Tiangang® HS-450The 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.

Molecular weight around 450 — mid-range: a workable balance between diffusion speed and retention.Melting point 155 ~ 158 °C — the processing window needs to reach above it for uniform dispersion.

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, nonwoven0.1 – 0.5%
Injection moulded and thick-wall parts0.3 – 1.0%
Fibre and monofilament0.3 – 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-450: molecular weight and volatility, basicity, and compatibility with the other components in the system. Its selling point is low water carry-over. Low-MW HALS tend to drag moisture into the melt, causing bubbles and haze; 450 targets exactly that.

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.

Technical reviewTiangang Technical CenterVersion2026-11-07
Specifications and application notes on this page are compiled from Tiangang's published technical data. Actual values are governed by the COA shipped with each lot and the technical agreement confirmed by both 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

Recommended Products

Products

UV Absorbers

400-094-4362