Science
Mechanism of Action
This silicone functions by forming a protective, breathable film on the skin's surface, which minimizes transepidermal water loss and locks in moisture without pore occlusion. It also imparts a silky texture to both formulations and the skin, temporarily smoothing the appearance of fine lines. Furthermore, Hexyl Dimethicone acts as a dispersing agent for insoluble powders, like mineral sunscreens or pigments, facilitating uniform application and enhancing product performance. Its water-repellent properties contribute to product durability and stability by increasing affinity for other silicone oils and improving spreadability.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Cosmetic Ingredient Review (CIR) Expert Panel noted insufficient data regarding the safety of dimethicone polymers, including related methicone compounds like Hexyl Methicone, when incidentally inhaled from products applied via airbrush devices. A related ingredient, Hexyl Methicone, demonstrated toxicity in rats at 5 mg/L in small particle aerosols, suggesting potential inhalation concerns for similar compounds in aerosolized forms, though this was within the context of overall safety for dermal cosmetic uses.
The Formula
Formulation
Stability
As a silicone, Hexyl Dimethicone is inherently water-repellent and insoluble in water, though it exhibits solubility in various organic solvents such as mineral spirits, acetone, ethanol, glycol, and fatty acids. While no specific optimal pH range for Hexyl Dimethicone's stability was identified, related silicone derivatives like PEG-8 dimethicone function stably within a pH range of 5.5 to 8.5. Formulators should be aware of potential compatibility issues with other ingredients, including carbomers, natural gums, and certain organic and inorganic UV filters or pigments, which could lead to stability problems such as viscosity loss or phase separation.
Conflicts
- carbomers
- natural gums
- organic UV filters
- inorganic UV filters
- pigments
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that dimethicone and related polymers, including Hexyl Dimethicone, are safe for use in cosmetic formulations designed for dermal contact, provided they are non-irritating. The overall maximum reported concentration of use for Dimethicone (as a broader category) increased to 85% for products resulting in dermal contact. However, the panel identified a data gap regarding the safety of these ingredients when incidentally inhaled, particularly from airbrush-applied products. Although a related compound, Hexyl Methicone, showed toxicity in rats at 5 mg/L via aerosol inhalation, this observation was considered within the context of Hexyl Dimethicone's overall safety for typical cosmetic applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hexyl Dimethicone is a versatile silicone valued for its ability to condition and soften skin, form a protective yet breathable barrier, improve product aesthetics, and facilitate uniform ingredient dispersion, all with a low risk of irritation or comedogenicity.
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