Science
Mechanism of Action
This ingredient functions primarily as a surface modifier, creating a film that effectively repels both water and oils from the skin's surface. It imparts humectant properties to the epidermis, contributing to a perceptibly soft skin feel. Within formulations, Stearyl Triethoxysilane significantly improves adhesion to the skin, enhances the wetting and dispersion of pigments within oil and silicone bases, and boosts the compressibility of powdered products. These mechanisms collectively lead to improved water repellency and extended wear of the cosmetic product.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Stearyl Triethoxysilane exhibits moisture sensitivity and is susceptible to hydrolysis, particularly in acidic aqueous conditions, which can lead to degradation. For optimal stability, formulations should be anhydrous or maintained within a neutral to slightly alkaline pH range.
Conflicts
- water
- acids
- strong oxidizing agents
- strong bases
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that alkoxyl alkyl silanes, including Stearyl Triethoxysilane, are safe when formulated to be non-irritating. However, the raw ingredient is classified with GHS statements H315 (Causes skin irritation) and H319 (Causes serious eye irritation) by PubChem, necessitating careful formulation. Toxicity studies on related silanes have been conducted at concentrations up to 2.6%, which are significantly higher than typical cosmetic use.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Stearyl Triethoxysilane is a valuable ingredient for elevating the aesthetic and performance qualities of cosmetic formulations, particularly for enhancing wear, water repellency, and texture, provided it is meticulously formulated to mitigate its raw irritancy potential.
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References
Sources