Science
Mechanism of Action
This ingredient primarily operates as a surfactant, reducing interfacial tension to effectively emulsify non-miscible liquids, thereby stabilizing formulations. On the skin, it delivers conditioning effects, promoting softness. As a dimethicone copolyol, it also provides humectant properties to attract moisture and emollient benefits to smooth and soften the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Demonstrates stability against hydrolysis and maintains integrity across a broad range of pH and temperature profiles. Its PEG moiety contributes to hydrophilicity and solubility in water and alcohols, with water solubility increasing proportionally to the number of alkoxy groups. However, formulators should note it can negatively impact the transparency of a composition.
Conflicts
- strong acids
- strong bases
- strong oxidizers
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed dimethicone copolyol, a broader class including this ingredient, 'safe as used' in 1982, reaffirmed in 2005. A subsequent 2014 assessment for polyoxyalkylene siloxane copolymers, which encompasses PEG/PPG-27/9 Butyl Ether Dimethicone, concluded safety when formulated to be non-irritating. While no specific maximum concentration for this exact ingredient is restricted, related dimethicone copolyols have been reported in products at concentrations up to 3%. The large molecular size suggests minimal percutaneous absorption.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG/PPG-27/9 Butyl Ether Dimethicone is a valuable multi-functional ingredient, offering conditioning, emollient, and emulsifying benefits with a strong safety profile and broad skin compatibility.
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References
Sources