Science
Mechanism of Action
This ingredient operates by forming a stable, three-dimensional siloxane polymer network or cage-like oligomeric structure on the skin's surface. This creates a non-occlusive film that aids in the longevity of cosmetic formulations and contributes to a refined skin feel.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
As a phenyl-substituted polysilsesquioxane, this ingredient exhibits excellent thermal stability, with minimal weight loss observed up to 381°C under a nitrogen atmosphere. Polycondensation reactions for its synthesis are typically completed around 50°C. While generally solvent-soluble (e.g., in THF, chloroform, ethanol), it is insoluble in water. Polysilsesquioxane resins may begin to soften and become tacky above 40°C, transitioning to viscous liquids around 120°C. Curing to form robust films can be accelerated using catalysts like dibutyltindiacetate or zinc 2-ethylhexanoate, typically at concentrations of 0.1-0.5%.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed polysilsesquioxane ingredients as a group, concluding their safety in cosmetics under current usage practices. While a specific maximum concentration for DIMETHYLHYDROGENSILOXY PHENYL POLYSILSESQUIOXANE is not explicitly defined, related polysilsesquioxanes such as Polymethylsilsesquioxane have demonstrated non-sensitizing properties at concentrations up to 50% in formulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This film-forming polysilsesquioxane is a safe and versatile ingredient, primarily offering cosmetic elegance and longevity to formulations, though specific skin benefits lack clinical study.
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References
Sources