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Polyurethane-45
AKA “Polyurethane polymer, Film-forming agent”
Ingredient
Ingredient Facts
Polyurethane-45
AKA: Polyurethane polymer, Film-forming agent
Ingredient · Film Forming · EWG: 4
Synthetic
Occlusive
Not Clean
Polyurethane-45 is a polymer made by the reaction of epsilon caprolactone and Trimethylolpropane with the cyclic trimer of hexamethylene diisocyanate.
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.
Creates Protective Barrier
Traditional Use
Synthetic polymer developed in the mid-20th century. Used in cosmetics as a film-forming and conditioning agent in hair and skin products.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR