Science
Mechanism of Action
As a polyether-modified silicone, PEG/PPG-12/16 Dimethicone performs multiple critical functions. It acts as an effective surfactant and emulsifying agent, stabilizing disparate oil and water phases within cosmetic products. On the skin, it forms a lightweight, vapor-permeable protective film, which contributes to its role as a skin-conditioning agent, emollient, and humectant. This film enhances skin feel by promoting slip, reducing tackiness, and imparting subtle light-reflecting properties, ultimately improving product spreadability and absorption.
Research
Clinical Evidence
High confidenceWhile precise optimal percentages for direct skin benefit efficacy are not established, PEG/PPG-12/16 Dimethicone and related dimethicone copolyols are functionally effective and commonly incorporated into formulations at concentrations ranging from approximately 0.5% to 15% to achieve desired product stability and sensory enhancements.
Key findings
- 01 Dimethicone Copolyol, an umbrella term encompassing PEG/PPG-12/16 Dimethicone, demonstrated no primary skin irritation when tested at a 40% concentration in aqueous solution.
- 02 In an undiluted state, Dimethicone Copolyol was identified as neither a primary skin irritant nor a sensitizer.
- 03 Clinical evaluations involving 201 volunteers confirmed Dimethicone Copolyol to be non-irritating and non-sensitizing.
Transparency
Dusting Analysis
No data available suggests that PEG/PPG-12/16 Dimethicone is commonly associated with dusting during formulation or application.
The Formula
Formulation
Stability
As an alkoxy polysiloxane featuring a PEG moiety, this ingredient exhibits excellent stability and chemical inertness under standard cosmetic conditions. Its versatile solubility profile allows it to dissolve in both water and alcohols, with water solubility generally increasing alongside the number of alkoxy groups and extended PEG chain lengths, which can also influence foaming potential and cloud point. It demonstrates broad compatibility with a diverse array of cosmetic materials.
Synergies
- Enhances the stability of emulsions when combined with traditional oil and water-soluble ingredients.
- Improves the dispersion and solubilization of active ingredients, perfume oils, and colorants.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that 'Dimethicone Copolyol' (an umbrella term including PEG/PPG-12/16 Dimethicone) is safe for cosmetic use, a conclusion reaffirmed in 2005 and 2014. The FDA's Voluntary Cosmetic Registration Program (VCRP) reported Dimethicone Copolyol in formulations at concentrations up to 10% as early as 1976. Related ingredients like PEG-12 dimethicone have been reported in eye products up to 10% and deodorants up to 15%. No specific SCCS (Scientific Committee on Consumer Safety) opinion for PEG/PPG-12/16 Dimethicone was found.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG/PPG-12/16 Dimethicone is a valuable, multi-functional silicone that significantly enhances formulation aesthetics and stability while providing broad skin compatibility and conditioning benefits with a low risk of irritation or sensitization.
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References
Sources