What it is
This oil-soluble copolymer forms a flexible film on the skin that helps hold pigments and UV filters in an even layer and improves wear. It also acts as a binder in pressed powders and adds body to oils.
Safety & warnings
As a large film-forming polymer it is generally considered low-irritation and non-sensitizing.
Origin & sourcing
Synthetic copolymer of vinylpyrrolidone and a long-chain alkene (eicosene).
Questions everyone asks
Why is a film former in sunscreen?
It helps the protective layer spread evenly and stay put, so the filters are distributed uniformly.
Is it a UV filter itself?
No, it does not absorb UV; it helps carry and hold the filters in place.