Science
Mechanism of Action
Functioning primarily as a film former, Polyurethane-5 establishes a non-occlusive, invisible layer on the skin. This layer is instrumental in reducing trans-epidermal water loss, thereby significantly contributing to sustained skin hydration and promoting a visibly softer, more supple complexion. Furthermore, this protective barrier can actively shield the skin from external factors, including pollution and adverse temperature conditions. In formulations, it also contributes to improved product texture and seamless application.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethane polymers generally exhibit stability under standard environmental conditions and are not expected to degrade within cosmetic products at typical use concentrations. However, prolonged exposure to temperatures exceeding 49°C or to UV radiation may induce alterations in their physical properties. Hydrolysis, influenced by both pH and temperature, can impact the urethane and urea linkages present in the polymer backbone.
Conflicts
- Acetone
- Cyclohexanone
- Dichloromethane
- Diethylformamide
- Methyl Ethyl Ketone
- Strong inorganic acids (e.g., Hydrochloric Acid 37%, Hydrofluoric Acid 48%, Sulfuric Acid 98%)
- High temperatures (>49°C)
- UV radiation
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that polyurethanes, including Polyurethane-5, are safe when used in cosmetics, provided they are formulated to be non-sensitizing and do not contain detectable residual isocyanate monomers. It is imperative to differentiate this from the known risks associated with occupational exposure to diisocyanate monomers or direct skin contact with liquid polyurethane, which can cause irritation or chemical burns.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-5 is a valuable film-forming ingredient, offering significant benefits for skin hydration and environmental protection when properly formulated in cosmetic products.
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