POLYURETHANE-55 is graded A (Safe) by Expert·ING, based on COSING regulatory data.
POLYURETHANE-55
Safety grade: A
A synthetic polymer that forms a flexible, protective film. It's similar to the plastic-like coatings used in various consumer products.
This ingredient conditions and strengthens nails by creating a protective, flexible coating that helps prevent breakage and brittleness.
Graded using: COSING.
Last verified: May 26, 2026
Other Nail Conditioning ingredients
- COMMIPHORA MYRRHA RESIN EXTRACT — Grade A
- ECHINACEA ANGUSTIFOLIA ROOT EXTRACT — Grade A
- VACCINIUM MYRTILLUS LEAF EXTRACT — Grade A
- 2-METHYLPROPANAL — Grade A**
- 4,4'-ISOPROPYLIDENEDIPHENYL/EPICHLOROHYDRIN COPOLYMER DIACRYLATE — Grade A
- ACETALDEHYDE — Grade F**
- ACRYLIC ACID — Grade A**
- AMP-ISOSTEAROYL HYDROLYZED SILK — Grade B