Science
Mechanism of Action
This ingredient operates by forming a physical film or barrier on the skin's surface. Its large molecular weight and chemical stability prevent absorption and direct biochemical interaction with the skin, ensuring a purely superficial effect.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyurethane-54, characteristic of polyurethanes, is susceptible to degradation by aqueous acids, alkalis, and steam. Optimal stability is observed around a neutral pH of 7.4, with degradation potentially occurring at acidic pH levels (4.0–6.5).
Conflicts
- Strong oxidizing agents
- Aqueous acids
- Alkalis
Safety
Safety Profile
The CIR Expert Panel has affirmed Polyurethane-54's safety for cosmetic applications under current practices, contingent on its formulation being non-sensitizing. As a large macromolecule, it is not expected to be absorbed or cause localized effects. However, careful formulation is critical to minimize residual diisocyanate monomers, which are recognized skin and respiratory sensitizers.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyurethane-54 is a safe, inert film-former suitable for cosmetic applications when formulated correctly, though its direct benefits for skin physiology remain to be fully explored.
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References
Sources