Science
Mechanism of Action
As a member of the polyurethane family, Polyurethane-75 functions primarily by forming an invisible, non-occlusive film upon application to the skin's surface. This polymeric layer acts as a physical barrier, which can reduce transepidermal water loss, thereby maintaining skin moisture. Furthermore, this film can help to anchor other active ingredients to the skin, potentially extending their functional duration and improving overall product performance. Some polyurethanes also exhibit structural similarities to components of the human extracellular matrix, suggesting a potential role in fostering a supportive environment for cellular processes.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethanes are generally robust. For optimal product integrity, storage and handling should adhere to recommended practices, specifically avoiding exposure to extreme temperatures.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated Polyurethane-75, alongside 65 other polyurethane ingredients, concluding that this class is safe for use in cosmetic formulations, provided they are designed to be non-sensitizing. A specific maximum concentration for Polyurethane-75 has not been established. However, for context within the class, Polyurethane-33 has been reported at a maximum concentration of 7.5% in leave-on dermal products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-75 is a valuable film-forming ingredient, offering benefits in product longevity and skin hydration with a well-established safety profile, though specific efficacy concentrations require further dedicated research.
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References
Sources