Science
Mechanism of Action
Polymethylsilsesquioxane/Trimethylsiloxysilicate functions primarily as a film former and skin conditioning agent. The Polymethylsilsesquioxane component is a spherical texturizing powder that scatters light, creating a 'soft-focus' effect to optically blur wrinkles and pores. It also absorbs excess sebum and improves product feel. The ingredient forms an invisible, permeable film on the skin that allows gases like oxygen to pass through, yet reduces transepidermal water loss, promoting hydration. The Trimethylsiloxysilicate component contributes to a durable, silky film that enhances makeup wear and water resistance, effectively holding pigments in place.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient exhibits excellent thermal and chemical stability, contributing to improved cosmetic stability and extended shelf life under standard ambient conditions.
Safety
Safety Profile
The CIR Expert Panel has deemed Polymethylsilsesquioxane/Trimethylsiloxysilicate safe for cosmetic use, noting its large molecular size which prevents skin penetration. It demonstrated no sensitizing potential in a Human Repeat Insult Patch Test (HRIPT) at a 50% concentration, nor was a related ingredient phototoxic at 5%. While Trimethylsiloxysilicate alone has been associated with potential comedogenicity, the non-comedogenic nature of Polymethylsilsesquioxane mitigates this concern in the combined ingredient, indicating a low overall risk.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polymethylsilsesquioxane/Trimethylsiloxysilicate is a valuable ingredient for its multifunctional benefits in enhancing skin appearance, product texture, and longevity across various skincare and makeup formulations.
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References
Sources