Science
Mechanism of Action
This ingredient functions primarily as a potent silicone emulsifier, expertly binding disparate water and oil phases to ensure homogeneous and stable product formulations. Upon application, it forms a lightweight, breathable protective film on the skin's surface. This film effectively minimizes transepidermal water loss, thereby enhancing moisture retention and fortifying the skin's barrier against external aggressors. Concurrently, it acts as an emollient and conditioning agent, lubricating the skin to promote a remarkably soft and smooth texture, while also improving product spreadability and visually softening the appearance of fine lines.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 At a 3% concentration in a BB cream formulation, PEG/PPG-18/18 Dimethicone demonstrated comparable stability and desirable properties when evaluated against other silicone emulsifiers.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
As a liquid ingredient, PEG/PPG-18/18 Dimethicone should be integrated into the silicone or oil phase of a formulation. To achieve stable water-in-silicone emulsions, the aqueous phase is gradually introduced into the silicone phase under high shear mixing. Its alkoxy polysiloxane structure, featuring a PEG moiety, contributes to its hydrophilic nature and solubility in water and alcohols, with water solubility increasing proportionally to the number of alkoxy groups. Typical usage rates range from 2% to 5%, though it can be safely used up to 10% based on regulatory assessments. It acts synergistically as a co-emulsifier and is highly compatible with both volatile (e.g., Cyclopentasiloxane) and non-volatile (e.g., Dimethicone) silicones.
Synergies
- Cyclopentasiloxane
- Dimethicone
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded in 2015 that PEG/PPG-18/18 Dimethicone is safe for use in cosmetics at concentrations reported at the time, up to 10%. It is permitted for cosmetic applications by the FDA. While there have been historical concerns regarding potential contamination with manufacturing impurities such as 1,4-dioxane, proper filtration during production is recognized as an effective measure to mitigate these risks.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG/PPG-18/18 Dimethicone is a valuable ingredient for engineering stable, elegantly textured, and skin-compatible formulations that provide a smooth feel and enhanced moisture retention.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources