Science
Mechanism of Action
By lowering the interfacial tension between incompatible substances, Ceteth-18 facilitates the creation of oil-in-water (O/W) emulsions. Its molecular structure features a lipophilic cetyl chain that anchors into oil droplets and a hydrophilic polyethylene glycol (PEG) chain that extends into the water phase, creating a stable barrier that prevents phase separation and enhances cleansing efficiency.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 Clinical irritation tests using 25% aqueous solutions of analogous alkyl PEG ethers demonstrated only negligible to slight irritation under occlusive conditions, confirming a high safety profile at standard usage levels.
- 02 Studies on concentrated ethoxylated cetyl ethers (up to 100%) in Epiderm skin models showed minimal to no irritation potential, supporting the ingredient's use in sensitive-skin applications.
Transparency
Dusting Analysis
As a functional emulsifier rather than a marketing-led 'active' ingredient, Ceteth-18 is rarely 'dusted.' It is typically included at concentrations necessary to achieve physical emulsion stability, usually between 1% and 10%.
The Formula
Formulation
Stability
Exhibits exceptional stability across a wide pH spectrum due to its non-ionic character. It is highly resistant to hydrolysis and maintains performance even in the presence of high electrolyte concentrations.
Synergies
- Electrolytes
- Non-ionic surfactants
- Lipophilic thickeners
Conflicts
- Strong oxidizing agents
- Strong acids at high temperatures (risk of ether cleavage)
Safety
Safety Profile
Quality control is paramount; the ingredient must be purified to contain less than 1 ppm of 1,4-dioxane and remain free from residual ethylene oxide impurities.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An essential functional component for creating stable, non-irritating, and cosmetically elegant formulations across all skin types.
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References
Sources