What it is
Polyester-1 is a synthetic polymer made from the condensation of polyols and polyacids to create a polyester chain. In cosmetic formulas it functions as a film former that helps deposit pigments and other ingredients in a continuous, even layer with good adhesion and a smooth finish. It is found in sunscreens and tone-up or color products where uniform, long-lasting application is desired.
Safety & warnings
Polyester-1 is a large polymer that generally stays on the skin surface and is well tolerated in leave-on products. It is not a recognized fragrance allergen. As a film former it can contribute to a heavier feel, but it is not commonly associated with comedogenicity.
Origin & sourcing
Synthetic, produced by polymerizing diol and diacid building blocks into a polyester resin.
Questions everyone asks
What does Polyester-1 do in sunscreen?
It acts as a film former, helping the product form an even, well-adhering layer and distribute pigments uniformly.
Is Polyester-1 natural or synthetic?
It is a fully synthetic polymer made by polymerizing diol and diacid components.