Science
Mechanism of Action
This ingredient functions by forming a very thin, coherent polymeric film on the skin's surface. This film's optimized cohesion, adhesion, and stickiness are designed to physically shield the skin, limiting the impact of various external aggressors.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
PEG-8/SMDI Copolymer readily dissolves in water, facilitating its integration into aqueous formulations. It exhibits stability under typical storage conditions, maintaining optimal performance within a neutral to slightly acidic pH range of 6.0-7.0, and should be protected from extreme temperatures.
Safety
Safety Profile
While the Cosmetic Ingredient Review (CIR) has classified the specific copolymer as having 'insufficient data' for a full safety assessment, its PEG-8 component has been identified as a mild sensitizer and irritant. The FDA recognizes PEG-8/SMDI Copolymer but notes an 'incomplete polymer record.' It is allowed in EWG VERIFIED products under specific restrictions and warnings, particularly regarding inhalable forms due to potential respiratory concerns and impurities. The SCCS has not issued an opinion on this specific ingredient.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While demonstrating film-forming properties and low topical irritancy, comprehensive safety data, particularly from CIR and SCCS, is insufficient to provide a definitive assessment for all applications.
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References
Sources