Science
Mechanism of Action
This ingredient operates as a linear polyether-modified silicone emulsifier, engineered to effectively reduce interfacial tension between two immiscible phases, such as silicone and water. By strategically migrating to and remaining at this interface, it forms a robust and flexible film, crucial for creating highly stable silicone-in-water (Si/W) emulsions. Upon application to the skin, it can de-emulsify, forming a protective silicone oil film that acts as a barrier, while simultaneously conditioning the skin for enhanced softness.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Panel testing indicated a high capacity for hiding skin imperfections and providing a pleasant skin feel in formulations, though specific efficacy concentrations were not quantified.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Optimal stability for emulsions containing dimethicone typically spans a pH range of 4 to 7, with 4.5 to 6.5 being most favorable. As a polyether-modified silicone emulsifier with an HLB of 7.0, it exhibits solubility in both water and alcohols, with water solubility increasing with higher alkoxy group counts. It also demonstrates strong compatibility with various organic oils and esters.
Conflicts
- Certain non-ionic, anionic, and cationic surfactants, particularly when combined with clay, may impair emulsion performance.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that 'Dimethicone Copolyol' (a broader category encompassing this ingredient type) was 'safe as used' in 1982, a finding reaffirmed in 2005. Although a 2014 CIR safety assessment for the group of polyoxyalkylene siloxane copolymers, including this ingredient, initially requested more specific individual data, the broader class retains its safe categorization based on previous assessments. Testing at 40% in aqueous solution and undiluted showed no primary skin irritation or sensitization. The FDA monitors its use in cosmetics via the Voluntary Cosmetic Registration Program (VCRP).
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG/PPG-20/22 Butyl Ether Dimethicone is a valuable polyether-modified silicone emulsifier and conditioner, offering stable emulsion formation, enhanced skin feel, and a favorable safety profile across all skin types.
Related
Similar Ingredients
Finding similar ingredients…