Science
Mechanism of Action
This ingredient forms a robust, three-dimensional polymeric framework upon application, creating an invisible, highly hydrophobic film on the skin's surface. This film provides a water-repellent barrier, enhancing the skin's protection against moisture loss and external elements while maintaining optical clarity.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysilsesquioxane resins containing silanols can be cured at elevated temperatures, though typical formulation and catalysis are performed at room temperature or below. Most resins tend to soften above 40 °C. Molecular silicas, particularly closed-cage structures, exhibit excellent chemical and pH stability. The slowest rate of silanol condensation, critical for polysilsesquioxane stability, is observed around pH 2, with increased rates below pH 1 and above pH 4.
Safety
Safety Profile
The CIR Expert Panel has determined Isobutyl Polysilsesquioxane is safe for cosmetic use under current practices and concentrations. Although dermal irritation was tested at 100%, typical concentrations in cosmetic formulations are generally lower; related polysilsesquioxanes are reported up to 55.2% in makeup. No SCCS opinion or specific FDA pre-market approval information beyond VCRP listing is available, as is common for cosmetic ingredients.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Isobutyl Polysilsesquioxane is a valuable film-forming ingredient, creating a water-repellent and transparent layer on the skin, with a robust safety profile and low irritation risk, making it suitable for sensitive skin.
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References
Sources