Tiangang® UV-P
Uv absorber (uva) · UV-P
efficient UV absorber for a variety of plastics and other organic substrates, including polyolefins, and engineering plastics, as well as PVC, PMMA, PU, PET, POM, polyesters, and various elastomers, and adhesives
In one sentence: A benzotriazole UV absorber with a 128 – 132 °C melting range and a 205 °C flash point, for transparent articles and coatings.
- Melting range: 128 ~ 132 °C (source: spec table on this page)
- Volatility (2% weight loss): 170 °C (source: spec table on this page)
- Flash point: 205 °C (source: spec table on this page)
- Transparent film and sheet dosage: 0.2 – 0.5% (source: recommended dosing table on this page)
What it is
Tiangang® UV-P 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. Product identifiers: melting point 128 ~ 132.
Technical data
| Chemical name | 2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol |
| CAS number | 2440-22-4 |
Structure | |
| Molecular Weight | 225 g/mol |
| Description | Tiangang® UV-P is an efficient UV absorber for a variety of plastics and other organic substrates, including polyolefins, and engineering plastics, as well as PVC, PMMA, PU, PET, POM, polyesters, and various elastomers, and adhesives, especially those with lower processing temperatures. When added to the substrates, it protects the substrate from UV degradation, preserving the original appearance and physical integrity of molded articles, films, sheets, and fibers during outdoor use. Dosage level of Tiangang® UV-P is between 0.10 and 0.5%, depending on substrate and performance requirements. When used in combination with Tiangang® series of Hindered Amine Light Stabilizers (HALS), synergistic performance is often observed. |
| Appearance | Melting range oC | Volatility 2% weight loss, oC | Flash point oC | |
| Tiangang® UV-P | Slightly yellow powder | 128 ~ 132 | 170 | 205 |
| Tiangang® UV-P | Acetone | Chloroform | Cyclohexane | Ethyl acetate | n-Hexane | Methanol | Water |
| 3 | 13 | 1 | 3.5 | 0.8 | 0.2 | < 0.01 |
| Tiangang® UV-P | 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. |
Melting point 128 ~ 132 °C — the processing window needs to reach above it for uniform dispersion.
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 UV-P: molecular weight and volatility, basicity, and compatibility with the other components in the system. General-purpose benzotriazole, low MW and compatible, suited to thin parts and coatings; watch migration in long-service outdoor use.
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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