Tiangang® HS-200 (Light Stabilizer 2020)

What it is

Tiangang® HS-200 (Light Stabilizer 2020) 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: CAS 192268-64-7.

Technical data

Applications and properties
 
 
 
 
 
 
 

Chemical name	1,6-Hexanediamine, N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-, Polymers with 2,4,6-trichloro-1,3,5-triazin, reaction products with N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine
CAS No.	192268-64-7
Chemical structure
Synonyms	Light stabilizer 2020
Applications and properties	Tiangang® HS-200 (Light Stabilizer 2020) is a high-end polymeric HALS and an import substitute for 2020, with good resin compatibility and good suppression of color and gas-fume discoloration.	Tiangang® HS-200 (Light Stabilizer 2020) is a high-end polymeric HALS and an import substitute for 2020, with good resin compatibility and good suppression of color and gas-fume discoloration.

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.

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-200: molecular weight and volatility, basicity, and compatibility with the other components in the system. A polymeric HALS of the 2020 class: broad resin compatibility and low gas-fade discolouration, suited to light colours and low-odour parts.

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.

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