Science
Mechanism of Action
On application, Polyurethane-11 forms an elastic, thin, and transparent film on the skin's surface. This film acts as a physical barrier, effectively reducing trans-epidermal water loss and shielding the skin from external aggressors like pollution. Beyond its protective qualities, it imparts a smoother skin feel, visibly diminishes the appearance of fine lines, and promotes a more uniform skin tone. It also contributes to the structural integrity and longevity of cosmetic formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethane-11 exhibits broad compatibility across various cosmetic formulations, from light water-based systems to rich moisturizing creams and strong fixing products. Its smooth texture facilitates seamless integration. While specific optimal pH for Polyurethane-11 is not defined, a related polyurethane adhesive demonstrates stability within a pH range of 5.5 to 8.5. General stability requires adherence to prescribed storage and handling, with avoidance of extreme temperatures.
Safety
Safety Profile
Polyurethane-11 is a synthetic polymer generally considered well-tolerated, though sensitive individuals may experience irritation. The Cosmetic Ingredient Review (CIR) noted 'insufficient data' for a conclusive safety finding in its 2017 draft report on polyurethanes, emphasizing the need to assess residual diisocyanate monomers, which are known occupational sensitizers. However, Polyurethane-11 itself has a high mean molecular weight (>100,000 Da) with no fractions below 1,000 Da, suggesting minimal dermal penetration. It has been reported in 315 cosmetic formulations, with a maximum concentration of 3.2% noted in loose-powder cosmetics. Specific SCCS restrictions are not detailed for this ingredient, and FDA status for cosmetic use remains unspecified.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While a versatile film-former with consumer-perceived benefits, a conclusive safety profile for Polyurethane-11 requires further scientific evaluation given the CIR's 'insufficient data' status.
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References
Sources