Tris-Biphenyl Triazine (Tinosorb A2B)
A newer particulate filter approved in the EU.
Banned in
- Palau
Also excluded where only mineral sunscreen is allowed
- Maui County
- Hawaiʻi County
Not approved in the US, so US sunscreens do not contain it.
Where it’s restricted
Named in the law or guidance
| Location | Status | Since |
|---|---|---|
| Palau law text ↗ | In force | January 1, 2020 |
Also not allowed under mineral-only rules
Tris-Biphenyl Triazine (Tinosorb A2B) isn’t named in these laws, but they allow only mineral (zinc oxide or titanium dioxide) sunscreens, so a product containing it is excluded anyway.
- Maui County (Maui, Molokaʻi, Lānaʻi) (in force since October 1, 2022)
- Hawaiʻi County (Big Island) (in force since December 1, 2022)
What the reef research says
A 2026 screening study of nine cosmetic UV filters included tris-biphenyl triazine (TBT). Under a conservative exposure scenario, the predicted water and sediment concentration ratios were acceptable for TBT. A separate 2026 acute test on algae and water fleas covered three other triazine filters (BEMT, DBT and EHT), and this filter was not among them. No measured coral or reef-species toxicity study for this filter appeared in the searches run.
- Integr Environ Assess Manag 2026: New Approach Methodologies in aquatic hazard and risk assessment of cosmetic UV filters (doi:10.1093/inteam/vjag121)
- Ecotoxicol Environ Saf 2026: Acute toxicity of novel triazine-based UV filters towards Chlorella vulgaris and Daphnia magna (doi:10.1016/j.ecoenv.2025.119584)
Related ingredients: Bemotrizinol (Tinosorb S), DHHB (Uvinul A Plus), Ethylhexyl Triazone (Uvinul T 150)
Last reviewed October 14, 2026.