Its protection is very good between 290 - 350 nm (UVB and UVA II range), and less good at 350-400 nm (UVA I) range. Polyglyceryl-3 Polydimethylsiloxyethyl DimethiconeĪnyway, it doesn't matter if it reflects or absorbs, Titanium Dioxide is a pretty awesome sunscreen agent for two main reasons: it gives a nice broad spectrum coverage and it's highly stable. PEG-9 Polydimethylsiloxyethyl Dimethicone