Science
Mechanism of Action
This polymer operates by creating a cohesive film on the skin's surface, which acts as a protective barrier. This film helps to mitigate skin roughness, improve tactile softness, and maintain skin moisture levels by reducing transepidermal water loss. Additionally, it can contribute to a formula's stability by acting as an emulsifying agent.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
POLYURETHANE-18 is typically dispersed in water or supplied as an emulsion. While its specific optimal pH range is not detailed, polyurethanes generally exhibit resistance to high-pH chemicals. However, hydrolysis can occur with prolonged exposure to water and elevated temperatures, potentially impacting its long-term durability. Some related polyurethanes are known to swell in specific acidic pH ranges (4.0-6.5) or at pH 7.4.
Conflicts
- Formulators must be cautious when combining POLYURETHANE-18, especially if supplied in an emulsion, with other ingredients containing sensitizers (e.g., methylisothiazolinone) to avoid reaching significant and potentially sensitizing combined concentrations.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed polyurethanes, including POLYURETHANE-18, safe for use in cosmetics under conditions that ensure non-sensitizing formulations. The panel specifically noted the absence of detectable residual isocyanates or other monomers. While raw materials may occasionally include sensitizers like methylisothiazolinone (MI) within their emulsion or solution, formulators are advised to manage overall concentrations to prevent elevated sensitization risk. The CIR's comprehensive assessment supports its safety despite some general 'high use restriction' notes from other sources.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYURETHANE-18 is a valuable ingredient for skincare due to its ability to enhance skin texture, provide moisturization, and form a protective barrier, confirmed safe for use when formulated to be non-sensitizing.
Related
Similar Ingredients
Finding similar ingredients…