Tris-Biphenyl Triazine
a.k.a. Tinosorb A2B
CAS 31274-51-8
Tris-Biphenyl Triazine, sold as Tinosorb A2B, is a newer-generation hybrid filter that absorbs across UVB, UVA2, and UVA1. It is approved up to 10% in the EU and Korea but is not approved in the US or Japan. It is photostable, EWG rates it 1, and it currently appears in 1 catalog product.
Frequently asked questions
What is Tinosorb A2B?
Tinosorb A2B is the trade name for Tris-Biphenyl Triazine, a newer hybrid UV filter that delivers broad-spectrum absorption from UVB through UVA2 into UVA1 from a single ingredient.
Where is Tris-Biphenyl Triazine approved?
It is approved in the EU and Korea, each up to 10%. It is not currently approved in the US or Japan, which restricts its availability in those markets.
Does it cover long UVA?
Yes. Its spectrum spans UVB, UVA2, and UVA1, so it contributes to the long-UVA range tied to skin aging and pigmentation, not just sunburn wavelengths.
Is Tris-Biphenyl Triazine photostable?
Yes. It is a photostable filter, which lets it maintain its broad-spectrum absorption during sun exposure rather than degrading during wear.