Science
Mechanism of Action
This ingredient functions as a non-ionic surfactant, reducing the surface tension between immiscible liquid phases to create and maintain stable emulsions. As a solubilizer, its unique structure allows it to encapsulate and suspend oil droplets, thereby integrating lipid-soluble compounds such as essential oils, vitamins, and fragrances into clear, water-based products. Furthermore, it imparts mild emollient and conditioning properties to the skin and can contribute to the modification of product viscosity.
Research
Clinical Evidence
Medium confidenceEffective as an emulsifier within a 1-10% concentration range for total formulation. When used as a solubilizer, a 2:1 to 5:1 ratio of solubilizer to the oil or fragrance being dispersed is typically employed.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyethylene glycols and their derivatives are generally chemically stable. While prolonged high heat exposure can cause a reversible separation into liquid and solid phases upon cooling, these phases are readily re-homogenized. Aqueous solutions can be sterilized by heating to 120°C, which may result in a slight pH decrease.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that PEGylated oils, including PEG-18 Castor Oil Dioleate, are safe in cosmetic applications when formulated to be non-irritating. Related PEGylated castor oils have been found safe at concentrations up to 50% and even 100%. The FDA has also reviewed this group of ingredients.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-18 Castor Oil Dioleate is a valuable formulating agent, proficiently solubilizing lipid-soluble components into aqueous systems and stabilizing emulsions, with a generally low irritancy and favorable safety profile for most skin types.
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References
Sources