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

POLYURETHANE-4

Safety grade: A

Polyurethane-4 is a synthetic polymer that forms a flexible, protective layer on the skin or hair. It's similar to the plastic-like coatings used in various consumer products.

This ingredient creates a thin, breathable film on the skin or hair surface that helps lock in moisture, improve product wear time, and provide a smooth, polished finish.

Graded using: COSING.

Last verified: May 26, 2026