Science
Mechanism of Action
This ingredient functions by reducing the interfacial tension between oil and water. Its molecular architecture—combining a hydrophobic C9-11 alkyl chain with a hydrophilic PEG-4 segment—allows it to encapsulate lipids and impurities, suspending them in aqueous solutions to be easily rinsed away or distributed across the skin surface.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 The CIR Expert Panel (2012) evaluated alkyl PEG ethers and confirmed safety in concentrations up to 50% for rinse-off products, provided the final formulation is non-irritating.
- 02 Safety assessments indicate that while 100% concentrations are severe ocular and dermal irritants in animal models, diluted cosmetic use remains safe for human skin.
Transparency
Dusting Analysis
As a functional emulsifier rather than a bioactive, 'dusting' is less relevant; however, concentrations below 0.5% may fail to provide adequate emulsion stability or surfactant activity depending on the lipid load of the formula.
The Formula
Formulation
Stability
Demonstrates excellent stability across a broad pH spectrum, including acidic and alkaline environments. It is highly soluble in alcohols and glycols but forms turbid dispersions in pure water.
Synergies
- Ethanol
- Isopropanol
- Glycols
Conflicts
- Strong oxidizing agents
- Strong acids
Safety
Safety Profile
Safe when formulated to be non-irritating. The 21% limit is typical for leave-on products to minimize the risk of irritation common to ethoxylated surfactants.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A reliable and stable emulsifying agent that provides essential structural integrity and cleansing power to complex skincare and hair care systems.
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References
Sources