Science
Mechanism of Action
This ingredient operates by creating a resistant and smooth film upon application to the skin, which contributes to conditioning and a refined tactile experience. As a polysilsesquioxane, it additionally aids in dispersing other cosmetic components evenly and precisely adjusting the overall viscosity of formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
As a polysilsesquioxane resin, this ingredient can undergo curing at elevated temperatures; it typically softens and becomes tacky above 40°C, transitioning into a viscous liquid around 120°C. This curing process can be accelerated by catalysts, usually at 0.1-0.5% concentrations, such as specific tin or zinc compounds. While generally considered a large, insoluble molecule, solubility within the broader polysilsesquioxane class can vary significantly based on specific chemical modifications.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded Ethyl Polysilsesquioxane is safe for cosmetic use within current practices and concentrations. It is categorized as a large, insoluble molecule, which means it is not expected to penetrate the skin. Concerns regarding dermal irritation and sensitization were alleviated by the weight of available evidence. As part of the broader silicone class, it is known to be resistant to oxidation, non-occlusive, does not intensify acne, is neutral to the skin, and can help reduce irritation. Ethyl Polysilsesquioxane is typically used at concentrations of 4.9% or less in cosmetic formulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Ethyl Polysilsesquioxane is a valuable silicone polymer, offering versatile film-forming, emollient, and textural benefits, deemed safe and compatible with all skin types at concentrations up to 4.9%.
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References
Sources