Science
Mechanism of Action
It functions by lowering the interfacial tension between the oil and water phases of a formula. The molecule's long polyoxyethylene chain (27 units) provides robust steric stabilization, preventing oil droplets from coalescing, while its ability to form micelles allows for the encapsulation and solubilization of water-insoluble substances like oils and fragrances.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 Clinical 21-day HRIPT testing on related high-EO Ceteareths confirmed zero sensitization and minimal irritation at concentrations of 1.5%.
- 02 Single-exposure dermal tests at 10% concentration demonstrated that higher ethoxylation chains (like 27) exhibit lower irritation potential compared to shorter-chain counterparts.
Transparency
Dusting Analysis
As a functional emulsifier rather than a 'hero' active, Ceteareth-27 is rarely used for marketing claims. However, if used as the primary stabilizer at concentrations below 1%, the emulsion's structural integrity may be compromised.
The Formula
Formulation
Stability
Exhibits exceptional stability in acidic environments (pH 2-4) where traditional emulsifiers often fail or hydrolyze. It maintains structural integrity across a broad temperature and pH spectrum.
Synergies
- Hydrophobic active ingredients
- Non-ionic co-surfactants
- Oil-phase stabilizers
Conflicts
- Strong oxidizing agents
- Extreme alkaline conditions
- Anionic thickeners (requires precise balancing to prevent viscosity loss)
Safety
Safety Profile
While safe for general use, the CIR Expert Panel advises against application on damaged or burnt skin to avoid potential systemic absorption of PEG components.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An essential formulation tool for achieving stable, elegant textures in complex skincare products, particularly those requiring high acid stability.
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References
Sources