Tiangang® HS-630
Uv absorber (uva) · HS-630
highly effective hydroxyphenyl-trazine UV absorber, which features both highly effective UV absorption, and low volatility. Compared to conventional bezotrazole UV absorbers, it gives polymers better protection against UV light
In one sentence: A hydroxyphenyl triazine UV absorber with high heat resistance and low volatility, for transparent films and coatings.
- Transparent film and sheet dosage: 0.2 – 0.5% (source: recommended dosing table on this page)
- Injection moulding and profile dosage: 0.3 – 0.6% (source: recommended dosing table on this page)
- Coating dosage (on dry film): 1.0 – 3.0% (source: recommended dosing table on this page)
What it is
Tiangang® HS-630 is a UV absorber (UVA). A UV absorber takes in 280–400 nm radiation and dissipates it as heat, acting as a filter layer at the surface. It does not scavenge radicals itself.
Technical data
| Chemical name | Hydrowxyphenyl triazine derivative |
| Description | Tiangang® HS-630 is a highly effective hydroxyphenyl-trazine UV absorber, which features both highly effective UV absorption, and low volatility. Compared to conventional bezotrazole UV absorbers, it gives polymers better protection against UV light. It is compatible with a range of polymers, co-additives and resin compositions, including polycarbonates and polyesters. It is also suitable for application in various polymer blends and alloys, such as PC/ABS, PC/PBT, PPE/IPE, PPE/PA and copolymers as well as in reinforced, filled and/or flame retarded compounds. 0.2 - 6% by weight can be readily incorporated into the polymer by using conventional techniques, e.g., powder, solution, or melt blending. When used with other Tiangang® HALS products often a synergistic performance is observed. |
| Appearance | Specific gravity, g/cm3@ 25oC | Melting range oC | |
| Tiangang® HS-630 | Light yellow powder | 1.15 | 88.0 - 91.0 |
| Weight loss | 2% | 5% | 10% | |
| Tiangang® HS-630 | Temperature (oC) | 307 | 327 | 343 |
| Tiangang® HS-630 | The 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. |
Where it is used, and at what loading
The difference from HALS is where it works: a UV absorber depends on its own absorption cross-section, so it is most visible in transparent film, coatings and sheet with a long optical path. In carbon-black or opaque systems its contribution is limited.
| Transparent film and sheet | 0.2 – 0.5% |
|---|---|
| Moulded parts and profiles | 0.3 – 0.6% |
| Coatings (on dry film) | 1.0 – 3.0% |
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-630: molecular weight and volatility, basicity, and compatibility with the other components in the system. A hydroxyphenyl-triazine UV absorber, not a HALS — the HS prefix misleads. Same family positioning as 570/630: high heat resistance, low volatility.
Frequently asked questions
Benzotriazole or benzophenone?
Benzophenones such as UV-531 are cost-effective and compatible but absorb at shorter wavelengths and migrate over time. Benzotriazoles (UV-326, 327, 328) absorb more strongly and resist migration, which is why engineering plastics mostly use them. Triazines (UV-570, UV-630) give the highest heat and weathering resistance for high-temperature processing and demanding outdoor parts.
Why pick a high-temperature grade for engineering plastics?
Engineering plastics are processed at 250–300 °C. A standard UV absorber volatilises or decomposes in that window, losing active content and contaminating the tool. High-temperature grades have a higher decomposition temperature and survive the process.
What should be watched when combining with HALS?
Acid-base interaction. Some UV absorbers and highly basic HALS interfere with each other in the same system and lose synergy. Our T-series packs are formulated with both sides of that balance in mind.
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.
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
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