Science
Mechanism of Action
This ingredient operates primarily as a non-ionic silicone surfactant, leveraging its unique polyglycol (ethylene/propylene oxide) modified polydimethylsiloxane structure. Its core function involves significantly lowering the surface tension between oil and water, enabling the formation and stabilization of robust emulsions. Beyond emulsification, it acts as an effective cleansing agent by aiding in the removal of impurities, and as a skin conditioning agent, providing a smooth tactile sensation. PEG/PPG-15/15 Dimethicone is also hydrophilic, capable of forming a protective film, and functions as a humectant to attract and retain moisture. It further enhances product formulations with anti-static and stable foaming properties, and its by-products may offer a degree of protection against light-induced degradation of sensitive components.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Clinical evaluations involving 39 subjects demonstrated that Dimethicone Copolyol (a broader category encompassing PEG/PPG-15/15 Dimethicone) in a 40% aqueous solution was not a primary skin irritant.
- 02 Further clinical studies on 39 subjects confirmed that undiluted Dimethicone Copolyol did not act as a primary skin irritant, and subsequent testing on 50 subjects revealed no indications of skin irritation or sensitization.
- 03 Independent assessments conducted on 201 volunteers concluded that Dimethicone Copolyol was both nonirritating and nonsensitizing to the skin.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Exhibits high emulsion stability across a broad temperature spectrum. It is generally stable and non-reactive within typical cosmetic physiochemical parameters.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has consistently affirmed the safety of Dimethicone Copolyol, which includes PEG/PPG-15/15 Dimethicone. Initial conclusions of 'safe as used' in 1982 were reaffirmed in 2005 and reiterated in a 2014 final report as 'safe in the present practices of use and concentration'. While some related PEGylated oils have been deemed safe up to 100%, a specific maximum concentration for PEG/PPG-15/15 Dimethicone itself has not been explicitly defined in the available CIR documentation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG/PPG-15/15 Dimethicone is a highly valuable and well-tolerated silicone surfactant, offering robust emulsification, effective skin conditioning, and broad compatibility across all skin types, making it a cornerstone in diverse precision formulations.
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