Science
Mechanism of Action
This ingredient primarily functions by creating a thin, protective barrier on the skin's surface. This film not only boosts water resistance of formulations but also extends their active delivery time. Concurrently, it aids in skin hydration, diminishes roughness, and imparts a perceptibly smoother, softer, and more elastic skin feel. Certain polyurethanes can also assist in emulsifying oil and water phases within a product, ensuring formulation stability.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethanes are susceptible to hydrolysis in highly acidic conditions (pH 1-3) and can also be affected by very high pH environments. Polyether types generally offer superior hydrolysis resistance compared to polyester varieties. It is frequently supplied as emulsions or solutions, forming complex mixtures.
Conflicts
- strong acids
- high pH environments
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed Polyurethane-13 and 65 related polyurethane ingredients, concluding their safety in cosmetic practices when formulated to be non-sensitizing, with no detectable residual monomers. The highest reported concentration of use for a polyurethane in leave-on dermal products, specifically Polyurethane-33, was 7.5%. While no specific SCCS opinion was found for Polyurethane-13, the FDA's general recognition of certain polyurethane resins for specific food contact applications implies a general safety profile, though it is not a direct cosmetic approval.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-13 is a valuable ingredient for enhancing product performance and skin feel due to its film-forming, moisturizing, and protective properties, coupled with a favorable safety and skin compatibility profile across all skin types.
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