Polyurethane-55

Synthetic

Skin Conditioner

Not Clean

OriginDerived from polybutanediol polymers and cyclohexane-based isocyanates, synthetic chemical precursors. Synthesized through polyurethane condensation reaction of polyols and isocyanates, then acrylate-capped.

Polyurethane-55 is the polymer formed by the reaction of Poly(1,4-Butanediol)-28, Poly(1,4-Butanediol)-14, and 1,3-bis(isocyanatomethy)cyclohexane. The polymer is capped with 4-hydroxybutyl acrylate.

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

Functions

Nail Conditioning

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

Strengthens nails

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

EWG

CIR

Safe as used

Pregnancy

Yes

Concentration Guide

CIR lists it as not reported to be in use.

CIR · report published 2017

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Verified Jun 2026

Data: CosIng · EWG · CIR