What it is
Styrene/MA Copolymer is a synthetic polymer formed from styrene and maleic anhydride monomers. In cosmetic and sunscreen formulas it acts as a film former that can help distribute and hold other ingredients evenly on the skin, and it can contribute to opacity and a soft-focus, blurring effect. It is also used to modify viscosity and the overall texture of the finished product.
Safety & warnings
As a high-molecular-weight polymer it stays on the skin surface and is generally considered non-irritating at typical use levels.
Origin & sourcing
Synthetic; produced by copolymerizing styrene with maleic anhydride.
Questions everyone asks
What does Styrene/MA Copolymer do in sunscreen?
It acts as a film former and can add a soft-focus, opacifying effect while helping modify the product's texture.
Is it a natural ingredient?
No. It is a synthetic polymer made from styrene and maleic anhydride.