Tiangang® HS-119

What it is

Tiangang® HS-119 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.

Technical data

Chemical name	1,3,5-triazine-2,4,6-triamine,N,N’’’-[1,2-ethane-diyl-bis[[[4,6-bis-[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl) amino]-1,3,5-triazine-2-yl]imino]-3,1-propanediyl]]-bis[N’,N’’-dibutyl-N’,N’’-bis(1,2,2,6,6-pentamethyl-4- piperidinyl)]
CAS number	106990-43-6
Structure
Description	Tiangang® HS-119 is an 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 and blends with EPR, EPDM, ERR, PE, EVA, EAA, EVOH and filled PP. It can be also used in elastomers, e.g. EPDM, SBS, SIS, SEBS, styrenics, ABS, SAN, AES, ASA, IPS, SMA blends or alloys and adhesives, hot melts, flexible and rigid PVC, PVDC, PU, PA, POM, PPE, PET, PBT and PMMA and thermoplastic resins, UPE, PET and PA fibers. It also shows a unique long-term thermal performance and can significantly enhances the color yield of many organic pigments and therefore it finds broad usage in PP fibers. Combined with other HALS, such Tiangang® BW-10LD it gives rise to synergistic mixtures. When combined with other co-additives, Tiangang® HS-119 is particularly effective for providing long-term stabilization to agricultural films, in countries with high solar irradiation, and in presence of chemicals.

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-119: molecular weight and volatility, basicity, and compatibility with the other components in the system. A monomeric HALS: fast radical trapping and easy dispersion, at the cost of volatility and migration. Long-service outdoor parts usually pair it with a high-MW grade.

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.

Upgrade path

See Tiangang® HS-625. Where the system contains sulphur-bearing agrochemicals, halogenated flame retardants or acidic fillers — anything that deactivates conventional HALS — look at HS-625 first: a low-basicity polymeric HALS, holder of several provincial and industry science awards, built specifically to resist protonation of the amine.

The advantage of 119 is fast onset and easy dispersion; the advantage of 625 is acid resistance. Pairing the two is common in long-service outdoor parts.

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