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PEG-4 STEARATE

CAS 9004-99-3
80

Safety score · 0–100

Good

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A lower-degree PEG ester of stearic acid with 4 moles of EO, functioning as a lipophilic emulsifier for water-in-oil formulations.

PEG-4 Stearate is the polyethylene glycol (4 mol EO average) monoester of stearic acid. With a lower degree of ethoxylation, it has a more lipophilic character (HLB ~9) and is commonly used in W/O emulsions and cleansing bars. The EU Cosmetics Regulation permits its use; it is not subject to specific restrictions. As a low-EO ester, it has greater potential for skin interaction than higher-EO variants, and may be slightly more irritating to sensitive skin or eyes in concentrated form.

Skin benefits

  • Lipophilic emulsifier for W/O systems
  • Contributes to rich texture in protective creams

Known concerns

  • Greater skin interaction than higher-EO variants
  • Potential trace EO/1,4-dioxane contamination

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.