HS-112 Low Molecular Weight Liquid NOR Light Stabilizer

What it is

Tiangang® HS-112 Low Molecular Weight Liquid NOR Light Stabilizer 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 Decanedioic acid, bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester, reaction products with 1,1-dimethylethylhydroperoxide and octane; CAS 129757-67-1; molecular weight 737.

Technical data

Chemical name	Decanedioic acid, bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester, reaction products with 1,1-dimethylethylhydroperoxide and octane
CAS number	129757-67-1
Structure
Molecular Weight	737
Description	Tiangang® HS-112 is a highly effective radical scavenger belonging to the Hindered Amine Light Stabilizers (HALS) family of stabilizers based on an aminoether functionality, also called NOR HALS.   It is a liquid HALS with low basicity, and high light stability in applications, like coatings, printing ink, and polyurethane lacquer. It prevents the surface from blowing-out, peeling-off, or chalking for pigmented paint, and is particularly suitable for high solid, acid catalyzed automotive and industrial coatings with high efficiency. Though not soluble in water, its liquid form also allows easy emulsification in water. It also has strong synergistic effect when used with a UV absorber.

Molecular weight around 737 — high-MW territory: little volatilisation or migration, which suits long-service outdoor or hot-processing systems, at the cost of slower 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.

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-112: molecular weight and volatility, basicity, and compatibility with the other components in the system. NOR-structured liquid HALS for the most acidic systems; the liquid form meters easily and disperses well in coatings.

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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