POLYESTER-18 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

POLYESTER-18

Safety grade: A

Polyester-18 is a synthetic polymer, which is a chain-like molecule made of repeating units created in a lab. It's commonly used in nail products to create a protective coating that hardens and stays on the nail.

This ingredient helps nail polish stick to nails, forms a durable protective film, improves nail health, and thickens the product to the right consistency for easy application.

Graded using: COSING.

Last verified: May 26, 2026