Science
Mechanism of Action
As a type of polyurethane, POLYURETHANE-76 primarily operates by forming a robust, yet flexible, film over the skin. This film acts as a physical barrier, offering protection against external factors such as solar radiation, extreme temperatures, and airborne pollutants. In more advanced applications, its ability to mimic the mechanical properties of native skin tissue has been observed to support tissue regeneration, facilitating fibroblast organization and re-epithelialization, particularly relevant in wound healing contexts.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethanes generally exhibit robust chemical stability, demonstrating resistance to environmental factors including UV radiation, moisture, temperature fluctuations, and atmospheric conditions. Specific polyurethane types vary in pH response; polyester polyurethanes are susceptible to hydrolytic degradation in alkaline (high pH) aqueous environments, whereas polyether polyurethanes offer superior hydrolysis resistance and perform better in the presence of moisture or mild bases. Studies suggest that optimal durability for certain polyurethane coatings is observed in neutral to acidic conditions, specifically between pH 4.5 and 6.8, compared to highly alkaline conditions (e.g., pH 13.5). Waterborne polyurethanes are engineered for aqueous dispersion through the incorporation of polarized segments or carboxylic groups. The material maintains its structural integrity with minimal swelling when immersed in water or various oils.
Conflicts
- strong acids (may cause degradation, particularly for polyester polyurethane variants)
- strong bases (may cause degradation, particularly for polyester polyurethane variants)
- residual isocyanate monomers (must be absent to meet safety standards)
- sensitizers (e.g., methylisothiazolinone), if present in supplier mixtures, require careful assessment to prevent exceeding hazardous concentrations in the final product
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated a broad spectrum of 66 polyurethane ingredients, including various numbered polyurethanes, and determined them to be safe for use in cosmetics. This assessment is contingent upon specific formulation practices: products must be non-sensitizing and contain no detectable levels of residual isocyanate or other monomeric components. Formulators are advised to carefully manage ingredients supplied in emulsions or solutions that may contain known sensitizers, such as methylisothiazolinone (MI), to avoid reaching concerning concentrations. The U.S. Food and Drug Administration (FDA) stringently regulates polyurethane use, mandating that cosmetic manufacturers adhere to rigorous safety protocols.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-76 is a valuable ingredient for forming a protective film on the skin, enhancing barrier function and offering environmental shielding, provided it is formulated according to safety guidelines to avoid sensitizers and residual monomers.
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References
Sources