What it is
Polysilicone-11 is a crosslinked silicone resin that forms a flexible film on the skin. In sunscreens it helps lock pigments and UV filters into an even layer, improves the longevity and feel of the product, and can blur the look of pores while imparting a smooth, soft-focus finish. It also helps thicken and stabilize the formula.
Safety & warnings
Silicone elastomers like polysilicone-11 are inert, non-irritating, and not known to penetrate skin, so they are generally very well tolerated even on sensitive skin.
Origin & sourcing
Synthetic; a crosslinked silicone polymer (elastomer network) manufactured from siloxane chemistry.
Questions everyone asks
What does polysilicone-11 do in sunscreen?
It forms a flexible silicone film that helps hold UV filters in place, smooths texture, and creates a soft-focus, even finish.
Is polysilicone-11 a UV filter?
No. It is a film former and texture agent; it improves how the sunscreen wears but does not itself absorb UV.