Science
Mechanism of Action
This ingredient functions by forming a non-occlusive polymeric film on the skin's surface. This film effectively enhances the water resistance of cosmetic formulations, prolongs the wear and efficacy of active ingredients, and imparts a luxurious, silky texture for an improved user experience.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While a specific optimal pH range for Polyurethane-43 is not detailed, general polyurethanes can exhibit pH sensitivity. Optimal performance for related polyurethane-based sensors has been observed within a broad range of 2.00 to 8.00. Careful pH adjustment is crucial during formulation, particularly when combining polyurethane dispersions with other components like acrylic emulsions, to prevent destabilization. Degradation, including swelling, discoloration, or tackiness, can occur under strongly acidic conditions (e.g., pH 1-3) or exposure to solvents such as acetone, xylene, and gasoline.
Conflicts
- High concentrations of known sensitizers (e.g., methylisothiazolinone) if present within the supplied raw material emulsion or solution.
- Strong acids (e.g., pH 1-3), which can lead to degradation.
- Strong solvents (e.g., acetone, xylene, gasoline), capable of causing swelling, discoloration, or tackiness.
- Silicone or butyl in specific adhesive applications, unless explicitly specified by the Original Equipment Manufacturer (OEM).
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that polyurethanes, including Polyurethane-43, are safe for use in cosmetic formulations, provided they are developed to be non-sensitizing and contain no detectable residual isocyanate or other monomers. Formulators are advised to verify that raw material emulsions do not introduce significant concentrations of other sensitizers (e.g., methylisothiazolinone). The FDA has specific stipulations regarding polyurethane resins used in food-contact adhesives, which, while not directly applicable to cosmetic topical use, indicate a regulatory awareness of these materials.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-43 is a valuable film-forming polymer that enhances product efficacy and imparts a smooth texture across all skin types, supported by a favorable safety profile when properly formulated.
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References
Sources