Science
Mechanism of Action
POLYURETHANE-42 functions by creating a continuous film upon application, which adheres to the skin, hair, or nails, thereby forming a physical barrier that can modify texture, offer protection, or improve product durability.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
POLYURETHANE-42 exhibits stability within a temperature range of 5 to 50°C, maintaining integrity for up to 3 years under standard storage conditions. However, the inherent urethane linkages are susceptible to hydrolysis in highly acidic environments, specifically at pH 1-3. Polyether variants typically demonstrate enhanced resistance to hydrolysis from water and alkaline conditions compared to polyester polyurethanes, suggesting careful consideration of pH in extreme formulations.
Conflicts
- Residual diisocyanate monomers, which are associated with potential irritation and sensitization.
- Strongly acidic conditions (pH 1-3), which can induce hydrolysis and degrade the urethane linkage.
- Mixtures containing known sensitizers like methylisothiazolinone (MI), if POLYURETHANE-42 is sourced as part of such a blend.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed polyurethanes, including Polyurethane-42, safe for cosmetic use when precisely formulated to be non-sensitizing. A primary concern is the potential presence of residual diisocyanate monomers, known to cause irritant and allergic contact dermatitis, as well as occupational asthma. In toxicity assessments, Polyurethane-42 yielded conflicting irritancy results: it was classified as 'moderately irritant' in a HET-CAM assay but 'non-irritant' in a Bovine Corneal Opacity and Permeability (BCOP) assay.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-42 is a valuable film-forming and surface-modifying agent for enhancing cosmetic product performance and durability, provided meticulous formulation ensures the absence of sensitizing residual diisocyanate monomers and optimizes pH stability.
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