Science
Mechanism of Action
This ingredient functions by forming an invisible, breathable film across the skin's surface. This polymeric layer acts as a physical barrier, which actively reduces transepidermal water loss, thereby enhancing skin hydration and mitigating roughness. Furthermore, this film can contribute to the water resistance and refined texture of cosmetic formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethanes can be prone to hydrolytic degradation. However, studies on similar polyurethane derivatives, such as Polyurethane-14, suggest stability within a pH range of 4.0 to 9.0, indicating this ingredient is unlikely to undergo significant hydrolysis under typical cosmetic conditions.
Conflicts
- Strong acids
- Strong alkalis
- Certain solvents (e.g., Acetone)
- Sensitizing monomers (if present in raw material emulsions/solutions)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed Polyurethane-23, as part of a broader group of polyurethanes, safe for use in cosmetics under current practices and concentrations, provided formulations are non-sensitizing. The Panel specifically noted that residual isocyanate or other monomers would not be detectable. While the FDA addresses polyurethane resins in certain food-contact adhesives, this does not directly apply to cosmetic safety for Polyurethane-23.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-23 is a valuable film-forming agent that supports skin hydration and texture, offering functional benefits to cosmetic formulations while maintaining a favorable safety profile when formulated thoughtfully.
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References
Sources