chti tio2 manufacturer

...

The main concern with nanoparticles is that they are so tiny that they are absorbed into the skin more than we want them (ideally sunscreen should remain on the surface of the skin). Once absorbed they might form unwanted complexes with proteins and they might promote the formation of evil free radicals. But do not panic, these are concerns under investigation. A 2009 review article about the safety of nanoparticles summarizes this, to date, in-vivo and in-vitro studies have not demonstrated percutaneous penetration of nanosized particles in titanium dioxide and zinc oxide sunscreens. The English translation is, so far it looks like sunscreens with nanoparticles do stay on the surface of the skin where they should be.  

...

Moreover, TiO2 can also improve the mechanical properties of plastics. It increases the stiffness and strength of the material, making it more resistant to impact and deformation. This is particularly beneficial in applications where plastics are subjected to stress or pressure, such as automotive parts and construction materials. By incorporating TiO2 into their formulations, manufacturers can create stronger and more durable plastic products without sacrificing their lightweight nature.

...