Science
Mechanism of Action
This ingredient operates by leveraging its dual nature: a lipophilic stearyl tail and a hydrophilic, negatively charged ethoxylated phosphate head. This structure effectively lowers the interfacial tension between immiscible oil and water phases, preventing their separation. The incorporated phosphate group further contributes ionic stabilization, which not only bolsters emulsion integrity but may also allow for improved compatibility with cationic components in a blend.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While specific optimal pH ranges were not explicitly found, related compounds are stable at low pH but disintegrate at high pH. Phosphate esters generally exhibit stability in slightly acidic to neutral environments. A 3% aqueous solution of a related compound, Steareth-10, is reported to be stable within a pH range of 5.0-7.0.
Synergies
- cationic ingredients (for enhanced compatibility)
Safety
Safety Profile
Steareth-10 Phosphate is recognized by the FDA Global Substance Registration System (GSRS). The Cosmetic Ingredient Review (CIR) Expert Panel has broadly assessed the safety of the 'Alkyl Phosphates' family and 'Steareth ingredients', concluding their safety under current use and concentration practices, provided they are formulated to be non-irritating. However, Steareth-10 Phosphate itself has not been assigned specific maximum concentration limits by CIR or received a specific opinion from the Scientific Committee on Consumer Safety (SCCS).
Your Skin
Skin Compatibility
Our Assessment
Verdict
While an effective emulsifier and stabilizer widely deemed safe for general use, its high comedogenicity rating warrants significant caution for individuals prone to breakouts or with acne-prone skin.
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References
Sources