Science
Mechanism of Action
On the skin, Polyurethane-57 functions as a film-former, creating a protective, non-occlusive barrier that helps to shield the skin from environmental stressors such as sun, cold, and pollution. It also acts as a moisturizing agent, assisting in moisture retention to visibly reduce skin roughness and promote a softer, healthier appearance. Within product formulations, it serves as a binder, ensuring the cohesion and structural integrity of powdered cosmetic ingredients.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While specific optimal pH for Polyurethane-57 is not explicitly detailed, related polyurethanes demonstrate varied stability; for instance, Polyurethane-14 is stable within a pH range of 4-9, and Polyurethane-21 remains stable from pH 7 to 11. Polyurethanes can also be engineered to be pH-responsive, swelling or degrading under specific acidic conditions. Many are supplied as aqueous dispersions or solutions, facilitating formulation.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel assessed the safety of 66 polyurethane ingredients, including Polyurethane-57, concluding they are safe for use in cosmetics at current concentrations and practices, provided the formulations are non-sensitizing. The panel determined that properly manufactured ingredients would contain no detectable residual isocyanate or other monomers, thereby mitigating concerns regarding these known irritants. The highest reported maximum concentration for a related polyurethane (Polyurethane-33) in a leave-on dermal product was 7.5%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-57 is a valuable ingredient, enhancing skin hydration, softness, and providing a protective barrier against environmental stressors, while also serving as an effective binder in product formulations.
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