POLYESTER-4 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYESTER-4

Safety grade: A

Polyester-4 is a synthetic polymer, similar to the plastic used in clothing and packaging, that is specially formulated for use in skincare and beauty products. It forms a lightweight, flexible layer on the skin.

This ingredient creates a protective film on the skin's surface that helps lock in moisture and improve skin feel, while also providing a smooth, long-lasting base for makeup and other cosmetic products.

Graded using: COSING.

Last verified: May 26, 2026