Tiangang® HS-3203

Name: Tiangang® HS-3203
Brand: Tiangang

Light Stabilizer for Coatings · HS-3203

Tiangang® HS-3203 is a versatile UV light stabilizer, suitable for example in a wide range of

In one sentence: A liquid combined system of a benzotriazole UV absorber and a low-basicity hindered amine, for coating applications.

Dynamic viscosity (25 °C): 10,000 mPa·s (source: spec table on this page)
Density (20 °C): 0.98 g/ml (source: spec table on this page)
Dosage at 10 – 20 μm dry film: 4.0% – 8.0% (source: grade description on this page)
Packaging: 20 kg per drum (source: packaging note on this page)

Core advantages

1. Liquid, easy to disperse
Liquid, easy to disperse

2. Weathering protection for coatings
Weathering protection for coatings

3. Prevents cracking and discoloration
Prevents cracking and discoloration

4. Long-term stability
Long-term stability

Technical data

Product description	Tiangang® HS-3203 is a high-performance compounded UV light stabilizer combining benzotriazole UV absorbers (BTZ UVA) with a new-generation low-basicity hindered amine light stabilizer (HALS). The combination works synergistically and is particularly suited to coatings that demand both durability and cost performance, meeting the requirements of a wide range of industrial and decorative coatings. Because HS-3203 uses a low-basicity HALS, reaction with acidic species in the coating system — catalysts, pigments and others — is minimized, giving better light stability than conventional systems. The product provides comprehensive UV protection for wood, plastic and metal coatings, effectively preventing discoloration, gloss loss, surface chalking and cracking, and extending coating service life.
Applications and how to use	Tiangang® HS-3203 is a versatile UV light stabilizer suitable for a wide range of wood varnishes and pigmented wood coatings, architectural coatings, industrial coatings, heavy-duty anti-corrosion and marine coatings, glass coatings and adhesives. It gives protection to acrylic, polyurethane and other coating resins as well as to pigments. Dry film thickness (DFT) directly affects the loading of UV light stabilizer. The following loading ranges can be considered (additive as a percentage of total formulation weight): 10 – 20μm, 4.0% - 8.0% 20 - 40μm, 2.0% - 4.0% 40 - 80μm, 1.0% - 2.0% * Actual loading must be determined by testing. Tiangang can assist with ageing tests and formulation screening.

Product description

Tiangang® HS-3203 is a high-performance compounded UV light stabilizer combining benzotriazole UV absorbers (BTZ UVA) with a new-generation low-basicity hindered amine light stabilizer (HALS). The combination works synergistically and is particularly suited to coatings that demand both durability and cost performance, meeting the requirements of a wide range of industrial and decorative coatings. Because HS-3203 uses a low-basicity HALS, reaction with acidic species in the coating system — catalysts, pigments and others — is minimized, giving better light stability than conventional systems. The product provides comprehensive UV protection for wood, plastic and metal coatings, effectively preventing discoloration, gloss loss, surface chalking and cracking, and extending coating service life.

Applications and
how to use

Tiangang® HS-3203 is a versatile UV light stabilizer suitable for a wide range of wood varnishes and pigmented wood coatings, architectural coatings, industrial coatings, heavy-duty anti-corrosion and marine coatings, glass coatings and adhesives. It gives protection to acrylic, polyurethane and other coating resins as well as to pigments.
Dry film thickness (DFT) directly affects the loading of UV light stabilizer. The following loading ranges can be considered (additive as a percentage of total formulation weight):
10 – 20μm, 4.0% - 8.0%
20 - 40μm, 2.0% - 4.0%
40 - 80μm, 1.0% - 2.0%
* Actual loading must be determined by testing. Tiangang can assist with ageing tests and formulation screening.

Tiangang® HS-3203	Appearance	Dynamic viscosity, @25°C, mPa·s	Density, @20°C, g/ml
Tiangang® HS-3203	Pale yellow viscous liquid	10,000	0.98

Tiangang® HS-3203	Water	Most organic solvents used in coatings
Tiangang® HS-3203	Insoluble	> 50%

Tiangang® HS-3203	The product is hygroscopic and must be stored sealed and dry. Supplied in 20 kg and 200 kg plastic drums or 1 tonne IBCs. Other pack sizes are available on request.

Frequently asked questions

Which coating systems suit HS-3203?

Wood clearcoats and pigmented coats, architectural coatings, industrial coatings, heavy-duty and marine coatings, glass coatings and adhesives. It protects acrylic and polyurethane resins as well as pigments.

Should it be combined with a HALS?

A UV absorber blocks UV; a HALS scavenges the radicals that still form. The mechanisms complement each other. Long-service outdoor coatings usually use both, with the ratio set by resin and film thickness.

At which stage is it added?

After pigment dispersion, during let-down, with thorough mixing. Avoid adding it together with the high-shear milling stage, which reduces local overheating and uneven dispersion.

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.

Related Products

HS-112 HS-765 C102 HS-3310

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

Products