Science
Mechanism of Action
This ingredient operates primarily as a film-forming agent, creating a cohesive, imperceptible layer on the skin. Its spherical particle structure allows it to function as a texturizing powder, effectively blurring imperfections and providing a temporary filling effect for fine lines and wrinkles. This dual action imparts a characteristic silicone-type softness to formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysilsesquioxane resins, including this ingredient, exhibit softening and tackiness above 40 °C, becoming viscous liquids by 120 °C. Curing, which forms robust films, occurs via silanol condensation and can be accelerated by catalysts such as 0.1-0.5% dibutyltindiacetate or zinc acetate. Optimal formulation and catalysis are typically conducted at or below room temperature.
Safety
Safety Profile
The CIR Expert Panel has deemed polysilsesquioxanes, encompassing POLYMETHYL/PHENYLSILSESQUIOXANE SILICATE, safe for use in cosmetics under current practices and concentrations, provided formulations are non-irritating. A related ingredient, Polymethylsilsesquioxane, showed only slight local erythema and dryness in a 28-day dermal toxicity study in rabbits at 200 mg/kg/day, with no significant toxicological findings. The reported maximum concentration for a related ingredient in makeup preparations is 55.2%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYMETHYL/PHENYLSILSESQUIOXANE SILICATE is a valuable ingredient for enhancing skin texture and blurring imperfections through its film-forming and soft-focus properties, supported by a favorable safety profile.
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