Polyurethane-27
AKA “Polyurethane-27, PU-27
Synthetic
Ingredient Facts
Polyurethane-27
AKA: PU-27
Synthetic · Film Forming · EWG: 4
Synthetic
Occlusive
Skin Conditioner
Barrier Support
Hair Care
Synthetic
Clean
A conditioning polymer that creates a protective layer on skin and hair, helping to lock in moisture and smooth the surface for a soft, polished feel.
CAS #
328389-91-9
Form
Powder
See origin →
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Protecting
Helps rebuild and strengthen your skin barrier — the invisible shield that keeps moisture in and irritants out. Essential after over-exfoliating or harsh weather.
Nourishes & Protects
Traditional Use
Modern synthetic polymer used in cosmetics for film-forming and conditioning purposes. Developed to improve product texture, stability, and protective properties.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR
Polyurethane-27 — Duck Heart Ghost